In that case, Rosa and Diddy also don't lose any MUs.
ZeRo beat all of Daddy's perceived bad MUs recently, including 3-0 ing Kirihara. Other Diddy players simply mess up in that MU.
On the same page, Rosa's aren't good at edgeguarding Cloud yet. And Rosa's have beaten MKs in their path recently. Both even.
So, a key point in evaluating any MU is actually looking at what tools a character has and evaluating when a player loses an exchange, or a game, is it due to a character attribute, or due to a player not knowing or choosing the correct option? If you infer an MU based off of recent set of a player, you are falling into the same recency bias as everyone else.
If I look at a given set, am I seeing superior play, or mistakes being made, or both? If it's mistakes, is that really due to the MU?
Basically, I don't really care who is beating who as much as
why they are beating them.
That actually requires analyzing the sets and takes more effort than simply saying, "Oh, Mr. R keeps losing to DK. Sheik must have a problem in the MU." Maybe it's true, but if you look across the sets, and see that Mr. R commits the same kinds of errors, errors that are intrinsic to style rather than character, it's a bit premature to declare DK/Sheik even, especially when other players demonstrate that the theory.
See, the issue is that this doesn't really hold up. What tool of Sheiks are players not using anymore? Needles are still good, but not nearly as much after the nerfs. And they don't stop opponents on platforms, so Sheik has to approach when, say, Lucario has Aura. Or to stop a Mewtwo from charging Shadow Ball. Because those will be a threat if she shoots needles at the wrong time.
And even ignoring her neutral (which is still really good, IMO), then you have to figure out how she'll convert that into a stock when she actually needs it.
Come on now. It's not a matter of what they are using versus how they are using them. It's like MK Leo's perfect pivots with Marth. They look fancy, they suggest something, but when he perfect pivots away into nothing, and then rolls when approached, what's the point ultimately?
Sheik has more safety than essentially every other character. She can literally not commit while pressuring in a wide variety of ways.
There is a problem with this meta, and when I see Void rush in or try ill advised trades when he has a stock lead, it's indicative of this meta and it's inability to play smartly when the tools are available to do otherwise.
Honestly, I think Pikachu is legitimately better at this, from comparing the two. I could very much be biased since Kirby can be annoying for Sheik to kill. But I tend to see many options that just don't cut it in many places. Like, great, you have multiple 50/50s based on DI and percentage - that's not reliable at all. Correct me if I'm wrong, but I feel like most Sheik players would probably give up most if not all of those fancy setups for Bayo bair alone. These setups are what Sheik is left with - not anything to be praised.
As slow as this meta is, and it is slow, fishing for kills with a single move is worse than being able to possibly convert off of more options. Rather, it will be worse.
Matter of fact, the poster boy for Sheik's kills - VoiD - has said for some time that Sheik being unable to kill is not a meme. But then despite using him as an example when they want to show how early Sheik can kill, I expect Sheik players to say that VoiD isn't using the proper setups.
VoiD has other issues than set-ups, and it largely has to do with decision making in disadvantage and neutral. I try not to base my opinions on what top players say in any given instance, because ESAM and Salem and Zero and kneejerk reactions are things.
And the thing is - I'm not saying Sheik is bad, or that she has HORRIBLE MUs. She can win any MU IMO - and that's what muddies the water a lot. Because you can say a lot of stuff about different performances in different MUs... But you can say the same about Fox - a character who is believed to lose to Sheik, yet certainly beats her regularly enough for someone to say it could be even.
You can say the same thing about any character, but there are some things that absolutely hold characters back. Diddy has exploitable air speed. Bayo can't land safely and has a poor approach. Cloud without limit is sus when recovering. Fox has no get out of jail free. Rosa is tied to Luma, who is dependent on other players not knowing what causes tumble.
A lot of what I see about Sheik is basically the same stuff we laughed at when it comes to Pikachu. It's 99.9% theory. Sheik's neutral is certainly great, and she gets kills way easier than characters of the same archetype (mostly DH), but it really doesn't amount to enough to put her with Diddy/Cloud/Bayo/Rosa. Three of whom have comparable neutral tools, and way better and more consistent ways to seal a stock from that neutral.
Sure. Except when they are playing against Sheik. What can any of them really exploit hard about Sheik, other than the fact she doesn't have a kill confirm? Sheik can absolutely get a lead easier than any other character. What's to stop a committed Hbox-esque player from playing "lame?"
It would be nice to see this version of Sheik that only exists in theory so far. But until then, it's going to be really hard to accept she's as amazing as people say.
EDIT: I'm so sorry, this is so long lol
EDIT 2: Anyone notice perfect Sheik is only compared to imperfect versions of other characters?
I mean, all of this is fine. You don't have to buy the farm I'm selling, here. I'm not a Sheik main. But when even I can pick out what the top Sheiks are doing wrong in any given game, and not properly exploiting their opponents given Sheik's frame data and tools, I'm not sold on her actually losing much of anything.
Now, that doesn't mean she is absolutely the best character. Maybe Cloud loses nothing and beats other top tiers harder. Maybe Diddy does. But this recent train of "Sheik is overrated" seems to be analysis free.
Actually, in regards to your EDIT 2:
Perfect Diddy still has crappy air speed. Perfect ZSS is still dependent on grabs and jumps in neutral. Perfect Bayo still can't approach well.
Perfect Cloud is
perfect.