the consequence is, that you can still brick your device if you re-lock it. That’s still true.
If you want to install /e/OS you have to unlock it und you have to unlock the criticals
After you have installed /e/OS and you have booted into the system without re-locking the bootloader (but relocking the criticals) and you have checked that all works and that “allow OEM unlocking” is still checked (but maybe greyed out) in developers option, you can boot back in fastboot mode and double-chek with the command:
fastboot flashing get_unlock_ability
If you get 1 NOT 0 then it is nearly safe to re-lock the bootloader
If you get 0, don’t re-lock it!
But until now there is NO no 100% guarantee that it will work
You can work with a open bottloader, that’s not the problem
Maybe some banking apps will not work. And if you leave your phone not alone, that somebody can re-flash it, it’s nearly safe. Depends on you if you accept this
typically yes. Until it is just open but not also rooted. Then, in my understanding, someone really has to have physical access
nobody knows, what the guys are doing…they don’t let themselves be heard here and don’t give out any information either. but you should assume so. I can’t imagine that the topic hasn’t reached you yet. When could something come? Nobody knows…
In addition to what @FairphoneHulk wrote (especially that there’s no risk as long as get_unlock_ability is set to 1): the problem (possible bricking) with locking the bootloader after installing /e/OS has alrady been fixed. So relocking the bootloader should now work without any problem.