^To be fair, though, in that Dan Gilbert talk, there was a metaphor about students taking photographs who had to give one of them up. In it, half the students were given the option of changing their mind for up to 4 days before it was final, while the other half had to give one up immediately and had no option to change their mind. Those who had no choice, they were ultimately happy with their decision. But those who had the option to switch, who had the option to change their minds, they were never happy even after they'd made the decision.
And ultimately, I feel like FFS and SRS are much more like the scenario with choices. We schedule a surgery date, and then have months to decide whether we really are going to do it or not. We still have the option of backing out if we're having doubts. So to me, it seems like we'd have the same issues with always wondering "what if?" that the students who could switch had. If we're on the fence about whether to do it or not and can't decide, we'll always wonder "what if?"
If you ask me, that presentation does teach something important, though. Having watched a lot of videos from trans women talking about SRS, many of them have said that they'd had friends who were unsatisfied with it. (Not necessarily regretting, but just not as happy as they thought they'd be.) And Kat Blaque especially said that in most of the cases she'd seen, it was because they had unrealistic expectations going in. They expected that their life would somehow be magically happy and perfect if they had the surgery done. So this talk really helped me think about what a good reason to have SRS is. Basically, what I think I'm getting is that if one is happy with how they are now, but expects SRS to somehow magically make them happier, it probably won't. They'll probably end up at the same level of happiness as before and will be disappointed. But if being pre-op is an actual problem, something that impairs their life, something that is about removing an active source of discomfort rather than chasing after happiness, SRS does indeed seem to solve those feelings of pain, and is therefore probably a good decision.