Unlock bootloader (depending on vendor, you have to do an online verification),
flash a recovery.img,
load into recovery mode (which, depending on the phone, might need extra work)
wipe some caches,
select new os/rom image,
pray it doesn't brick your phone.
You'd think someone would've learned a thing or two from the easy graphical installations linux and even windows have been offering since the late 2000s.
Absofuckinglutely yes I would.
The big phone manufacturers banded together to extinguish that modular phone startup because it would have been too good for consumers. Then they made it harder to swap out phone batteries to punish us for dreaming.
Edit for sources: https://en.m.wikipedia.org/wiki/Phonebloks https://en.m.wikipedia.org/wiki/Project_Ara