A lot of this forum is about hypotheticals - that's true, which, and lets be clear, are about fantasy - imagining alternative realities and arguing stuff that can't be proven. Whether it's the slight hesitation on match point or imagining a player didn't exist or was 10 year older, it's all the same - fantasy.
You may be right about the French Open final being a critical match for Tsitsipas, it was his first slam final, so it would be astonishing if it wasn't. Certainly it must have had a short term psychological effect on him at the very least.
You're comment on his cramping is interesting, you talk about it in the present tense about it being 'something that can be resolved', well it's a past event, it can't be resolved and even if it was resolved at the time, we cannot know the consequences of that. It's as unknowable as any other hypothetical, if Fed's forehand had gone in at 40-15, If Alcaraz hadn't cramped against Djokovic at the French semi, If Rafter hadn't cramped against Agassi in the Australian semi, and that's just cramping, we can think of millions of these hypotheticals that can never be known - that's just how the world is.