I am familiar with Meta's interviewing policy, which proscribes LC "hard" type problems. I don't know the contents of every single interview, obviously. Your interviewer(s) violated explicit policy if you were given LC hards.
In a way does it matter? The interviewers aren’t making the final decisions and the actual hiring committee aren’t stupid and should be able do some basic normalization.
I think it probably matters to the individual interviewees and also matters to the hiring committee because it reduces the quality of the hiring signal.
