I use an old android phone reflashed to e.os using f-droid. I think all those threat modes are avoided by using it. I don't think it is safe for every user to

I use an old android phone reflashed to e.os using f-droid. I think all those threat modes are avoided by using it. I don't think it is safe for every user to do the same I did, but I'm glad I could do it. I think a reasonable solution would be something like a hardware seal that unlocked the bootloader once broken. If the vendor worries about how this may affect them, breaking the seal could also void device warranty. I'd gladly buy a second hand still powerful device, void its warranty and install whatever I wanted on it.