I'm glad to confirm your suspicion. I like to have both a walled-garden phone and several open-platform computers. They do two completely different things for me.
To be honest, I'd like my open computers to be even more open and hackable, with a secure boot path that doesn't involve any mysterious unpatchable embedded firmware or auxiliary CPUs, but we are slowly getting there with RISC V.
The point is that no one forces you to jailbreak your iPhone. If you like the walled garden - great! Keep using it! But I've been in plenty of discussions where iPhone users are literally against jailbreaks at all and in any form.
I want the same kind of phone. But I reject the premise that it's impossible to have a deeply nested "De-wall this device yes I know what I am doing yes I confirm I'm about to really open myself to issues if I don't understand the implications" settings option without compromising the walled mode security.