I go canon in prime timeline... but I've long thought of TOS as only semi-canon anyway *ducks*.
But seriously, I decided in my teens (having already seen lots of TOS before TNG started in the UK) that TOS might be the spirit of Trek, but large portions of it needed to be ignored as "apocrypha" in order for it to make sense as one timeline. Including much of the design aesthetic. To me, everything TMP onwards really pushed TOS visuals into the category of "vague approximation of what it was always meant to look like".