I'm OK with it being difficult because that weeds out people who lack the technical capacity to do it, and thus also almost certainly lack the understanding to critically evaluate the safety of it.
A below-average software developer is probably still a standard deviation above the mean when it comes to competence with computers, and we're not optimizing for developers here.
TBH, the case I am more worried than most about is that the actual, biggest use of this will be, not might but will, addiction-mongers in the games space suckering people into downloading apps that are uninhibited by even the relatively low walls that Apple puts into place. Even things as simple as "have a standard payment flow so people know when you are charging them for money" is then off the table, and that makes doing evil really, really easy.
A below-average software developer is probably still a standard deviation above the mean when it comes to competence with computers, and we're not optimizing for developers here.