[amaccuish]

It should be said though that only Pixel, Fairphone, and maybe some Motorolas support relocking the bootloader with a custom OS.

Without that ability, anyone can plug in to your phone and write whatever they want to the internal flash and your phone will be none the wiser.

[JCattheATM]

The OnePlus6T supports it, it will still display a warning but it will be locked.

[lucb1e]

Happens to me all the time. Also on laptops, secureboot is such a life saver any time you're out and about

...it's sure nice this exists and is available to anyone but it's not seriously a risk if you're not of interest to people who are willing to physically show up and bug your hardware in a way that requires quite a bit of preparation

[Klonoar]

Some Sony models (not the Verizon one last sold in the USA) should too, no?