I'm a sheik main, and here are my thoughts and counters to your points.
First off thank you so much for being mature about this. Props to you. I'm not sure if we already have a thread covering this (we probably do, but I'll leave those specifics to our mod
_Tree
) and if we do I like the way you've made this thread, so I'll reply anyway.
Many players, butthurt sore losers or not, do not like sheiks recovery and her needles. On streams commentators commonly say that her needles are the best projectile in the game, and that her recovery is one of the best. They are both very good, but often not in the way people think.
Vanish (sheiks UpB) doesn't actually lift her very high. It does have quite good vertical recovery, but many characters have UpBs which go higher. It is good because it can go in any direction, and has hit boxes at the start and end, as well as the invincibility and the wind box.
Because sheik disappears soon after activating vanish, the opponent has no way of knowing where she will go, meaning we can mixup landing onstage or on the ledge. During the startup sheik moves a bit in the direction inputted, but we can always mix that up too. When sheik is invisible she is invincible, so she isn't very easy to edge guard. Changing that would be a huge change and I don't think it's necessary or will ever happen.
The hit boxes and the wind box are what people hate on most.
The first hitbox is one of sheiks most used killing options, so a nerf there would really hurt the character. Because sheik becomes invincible shortly beforehand it is very hard to edge guard against. Invincibility starting slightly later would be a nerf that would be fair.
The second hitbox occurs when sheik reappears, as does the wind box.
I do not care for the second hit, and it in my opinion makes our recovery a little too safe. Obviously shield it and punish but still. The wind box is fun to utilise, as when spaced and timed correctly it can stuff recoveries that don't ledge snap. It can be shielded when sheik lands onstage, and is very punishable. If the windbox catches you shoot a projectile.
IMO if anything ditch second hitbox keep windbox.
Sheiks needles. This is where stuff gets interesting.
Sheik can control some characters (eg dk and ganon) with needles at high percents. They can be dealt with however. Staying grounded or on platforms at high percents and just shielding them works fine. Jumping over them is easy, and sheik actually has a decent amount of lag after throwing them ( I think more than grenjnja after shurikens). She's slready been nerfed there, meaning if sheik misses them she can be punished.
If the zoning character gets beaten by sheik needles then the player is just bad at zoning.
What makes needles the best projectile in the game is the movement options and combos it allows for. B reverse needles, wave bouncing, c-bouncing, INC, all give sheik some of the best movement in the game, AND SHE DOESNT EVEN THROW THE NEEDLES! Of course she has the option to and that pressures the opponent but that's a bonus.
Needles setup for one of sheiks absolute best killing options, needles to bf. Needles are amazing offstage, but onstage I use them almost exclusively for movement.
People complain about their range, but that's just grabbing at straws. It's a projectile, of course it has range. Far lass than falco lasers and others.
Nerfing needle startup, idk about that, but would totally accept a knockback nerf.
Now to BF.
Sheiks best move. Great for edge guarding, bounces off the stage, can be angled, can make the hit come out early, can be comboed out of almost all of her moves at some point, can hit up to 3 times...
Oh how I love that move.
And oh how we rely on it.
If any of those things were removed or nerfed sheik would feel it so hard. If it sent you into tumble it would be so ass. We'd probably drop a tier.
And even though people thinks it's safe on shield, it is so not.
Some characters can punish before the second hit even comes out (eg Roy UpB). If you dash and follow her then shield the second hit she can only it it 3 times so you get a punish eventually.
There are so many ways to punish it, there could be a whole thread on it.
And that's if you get hit on shield.
Overall, I think sheik is in a good place. Nerfs I mentioned could be acceptable. Remember that sheik is one of weakest (damage wise) characters in the game, and so sheik has to combo, and it takes time and dedication to learn her to her full potential.
I spent ages writing that so I'm gonna trail off now, and maybe write more later, when it's not 2am.
_Tree
posted a video exactly on this topic so go check it out.
I'm getting tired so I think I'll randomly finish soon. May add more after doing more research and discussi