Key enablers that ensured those plans fall apart were PC platform and default code freedom on it. It doesn't work because anyone can just compile the clean versions of apps using gcc, on PC. Same cannot be guaranteed on Android and is not even happening on iOS.

We shouldn't have shrugged off the weird feeling of shackles on our wrist when iOS(iPhoneOS) was first released. We should not have relied on geohot stopping by and dropping a jailbreak he found. We should have voted to force it open by law.

cannot emphasize this enough. Workarounds were always tolerated because they silenced the potential competition until the frivolous features that people did it for (namely customization) were all available by default, closing the door for what Apple actually hated (side-loading). They are expert software politicians, just look what they do with the EU's open-ecosystem demands