>Go to https://wiki.lineageos.org if you want to install and/or compile for a phone.

There are a lot of phones missing from there though.

None of the missing ones have proper, official, upstream LineageOS support. If you install LineageOS on these, you install somebody's own, personal fork of LineageOS. Which might be totally fine, of course. But because of the necessarily different signing keys alone, it's a (potentially) very different thing.