I'm not understanding your argument. You say that unlocking a bootloader is dangerous, so what's your solution? You can't have non-unlockable bootloaders because that would mean a loss of hardware functionality, which you just suggested you consider unacceptable. You can't have easily unlockable bootloaders because that would be dangerous. So now what?

I proposed a very reasonable solution that gives the user control AND responsibility of their own device. If you don't want the responibility (and the control) then stick with your manufacturer's locked bootloader and never touch it.

I don't know about you but I would really like if my work phone had a company-set bootloader lock just like my work laptop has a company-set BIOS lock in case someone steals it or gets lost. There are plenty of professional and personal reasons why my solution would make a lot of sense in my opinion.