Relatedly, there isn't a human such that I would reliably want to live in a future where that human obtains extreme superhuman power. (It might turn out OK, or at least better than the present, but I wouldn't bet on it.)

Just be careful to note that there isn't a binary choice relationship here. There are also possibilities where institutions (multiple individuals in a governing body with checks and balances) are pushed into positions of extreme superhuman power. There's also the possibility of pushing everybody who desires to be enhanced through levels of greater intelligence in lock step so as to prevent a single human or groups of humans achieving asymmetric power.