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iPhone owners should be able to install whatever they want on the device they purchased.

They can. It is the iPhone OS, which they do not own, that does not support this.

No, it's the boot loader, locked to the device that they own, that actively blocks loading unsigned software.

The boot loader is likewise software which you do not own. You're free to replace it along with any other software.

I'm kinda curious how Apple would respond if someone did come up with a custom bootloader and OS that worked on the iPhone...

Ah well. There's always Android.

But practically it's impossible to write a bootloader with equivalent functionnality.

Software's hard! Let's go shopping!