TOS and movie characters both use present-day wordplay. both eras are mostly very immersively written. the action feels right. spock, in particular, feels very right in both. saavik acts and talks like robin curtis. but the use of 21st century contemporary slang doesn't work well. it's like when they drop F-bombs on discovery or picard. if anything, the TOS characters should use 1960s phrasing, and the movie era late 80s / early 90s speak. no one in the 1960s, certainly not on television, would say "good call" when they agree with a course of action. and that's the world the TOS characters live in.