"Mayhap"

[Shurrikhan]

I absolutely hate how they use thee/thou, etc, all over the place, because they use it to mean formal speech when it is actually the informal/personal when it was in use in English?

It's not being misused, though. Thee/thou is not used in-game towards people of higher rank/status by any speaker who differentiates the two. (And it's worth noting, English historically had multiple simultaneous dialectal conventions surrounding 'thou' vs. 'you'.)

Note that you spend most of ARR either as a colleague, for whom constant use of 'you' among in-game dialects that differentiate the two would be rudely stand-offish, or as a stranger under the assumed status of a mere adventurer (in essence, a mere contractor, derpy recruit, or murder-hobo).