I don't have an issue with your fabricated hypotheticals because I'm evaluating what actually happened. And seeing someone who knew they couldn't perform to their usual standard and as a result decided it was best for them and the team to pull out. And knowing your limits and when to call it is not weak. Getting help is not weak.
Simone has been spectacular in these current Olympics at age 27 (3 gold , 1 silver) so obviously she made the correct decision long-term, even if people like you are hung up on her decisions and labeling them as negative.
To put it into terms you can understand, if Jared Goff was NFL MVP numerous times and won half a dozen Super Bowls but pulled out of one big game... Yeah dude, I wouldn't think he was weak. At all. I'd think he's one of the best of all-time and that takes a level of commitment and toll that most of us will never understand. I'd trust Goff to make the right decision for himself given his massive track record of success and being one of the best to ever do the job.
The question is why you think you know better than Simone Biles?
Scracth all that.
Why does it matter if Bench of Izlez or heyfolks or ASP think that someone is weak as shit? It doesn't. She did get too many plaudits about it being heroic to step aside. Like, it was a smart move and it was brave because she was certainly going to face backlash. But knowing your limits isn't heroic and that's where it'll lose me for overpraise of Simone.
I mean, honestly, people called Franzen "weak as shit" his whole career. If Tomas Holmstrom ever once said "I'm not going to stand in front of the net and get whacked on today, I'm not feeling it", he'd be called weak as shit. A guy like Paul Kariya who got concussed several times and as such played a lot more passive later in his career got called weak as shit.
Basically my point is that athletes gritting through injuries or mental blocks can be impressive, but it shouldn't be the expectation. It shouldn't be "sacrifice your physical and mental well-being for my amusement, puppet" or I'll light you up. Just this past year, Amon-Ra St. Brown played the entire second half of the season with hurt ribs and every single playoff run in hockey, one of the fun things as a fan is to see the injury reports come out after the Cup finals when you see just how freaking banged up all these guys are. Hell, I gave Brent Gilchrist 18 gajillion miles of shit for sucking at hockey as a kid and I come to find out from the story that he was getting cortisone shots and playing on like a fiber of a groin muscle all of those runs.
To bring it back... Simone thought she was good at the start of the Tokyo Olympics and quickly realized something was wrong. They have alternates for that reason. Would it be any different to you if she had done her vault and came down wrong and shattered her leg?