This game (as well as most head-to-head competitions) is not about "deserving" to win, as you don't gain merits of any kind. It's all about the scoring.
It doesn't matter if flashy, campy, with frowned strats, if you really outplayed someone, or simply got lucky.
Else we would had judges awarding victories based on how they performed (yay SSB64 combo contests!).
I know, and I agree.
SDing is just something else, caused by a (harsh) mistake at a very bad position of the player it happens to. It's completely the players fault, and it can give the other one the win or at least get rid of a whole stock, no matter the %.
Obviously this can decide matches and sets and might cause the player it happens to to lose for free.
Is it a mistake by the player it happens to? Yeah.
Does the player deserve to get punished for it? Sure.
Will the player who it happened to lose if it's the last stock of the match/set? Yup.
Is it a legit win over the player tho? Not really.
I mean you can twist and turn this around however you want and compare it to other things. I also can't see "hitting the opponent once and then running away the rest of the game for a timeout win" as a legit win, although you have to question how that was possible in the first place. Realistically this shouldn't be possible, otherwise such stages/tactics would be deemed too powerful and banned, and if it was to still happen, then the timed out player must have lost his "RPS" game against his opponent like 500 times or something, so he was just outplayed. So I'd count it as legit. But that's besides the point.
Imagine you have a WF, GF1 and GF2 with the same players, every time going to game 5, and in the final game it's totally even, both of them got rid of the first stock of the other and are at 0 %, then suddenly one of them has a huge run, got many reads/predictions correctly and suddenly it is 0 % to 150, then he accidently dairs above the edge with a dair similar to Sonic/Sheik/ZSS when he wanted to bair and falls offstage and dies. That's not a legit win or me, sorry. It will be counted obviously and will be seen as the ultimate decision of the game and obviously the one who SD'd got 2nd, maybe "losing" a lot of prizes, fame or whatever through not getting first, but it was not a legit ending of the match/set/tourney.
All of the stuff about it being consecutive or the final sets or game 5 shouldn't even matter and just the SD itself making the outcome not completely legit in my eyes.
Or imagine 2 players playing 50 sets. In 49 the same player wins, in 1 he loses because of an SD. Is the other player better in that one set? Not imo. But he still won it, just not legitimately. But that's just my opinion on the matter.
If the SDing player had 150 % and the other one 0 then the outcome could've very likely stayed the same anyway and I wouldn't see that as a really unlegit win, though. Just not 100 % legit.
I guess you can see it differently. It's legit enough to "count" (if that automatically makes it legit in your eyes then it might just be semantics we're disagreeing on) - I'm not disagreeing with that.
You could say I'm looking at it at a.. (idk a fitting word for it but something like) "personal/philosophical" level and not at a mathematical one (which just says the other won).
In MUs and such you should always have to take into account how it happened, but that's something else anyway.