Multi-select: Useful if I want to do a find-replace, but only within certain select results for the "find" part. If I know where they are I can use Cmd+D or multi-select to just find those quick rather than crafting a nice regex find-replace query with "only in selection" etc.
Ligatures: It's SUBJECTIVE. I dunno why you're throwing out ad hominems like "only for frontend developers who like <things I think are bad>". I am looking at code for 8-12 hours a day. If ligatures make the code nice to look at, why the heck do you care what my code looks like? My ligatures aren't being pushed into your environment.
This is like judging someone as "lesser" than you because they like a different mouse because it's comfortable for them...