If they allowed something similar on iphones, I'd switch to an iPhone the day an alternate os worked well enough for daily use.
I think it would be nice if we could run unsigned apps on iOS (in the US), but booting your own OS on an iPhone is a whole different story
Apple enforces those restrictions via the permanently locked bootloader. The main benefit of unlocking the bootloader on an iPhone would be to run a modified version of iOS that allows for the installation of unsigned apps. Apple wouldn't like it and might even get litigious over it, but still.
> (in the US)
Apps intended for release onto alternative app stores in the EU, Japan, and Brazil still need to be approved and signed by Apple. These laws were nearly useless.
Really, all I want from a phone is to be able to run Linux/xfce on it.