I think the terminology is helpful because although systems might slant to one version out of the three, you can generally lean into the various modes to vary up combat between sessions.
Like, a grueling dungeon crawl, versus a one-fight-a-day spectacle about unwinding, versus a mechanical heavy battle with a foreshadowed gimmick against a boss or whatever.
One OSR pitfall is often assuming every combat must be the same, and 4e-type systems can fall into that trap as well.
Imo all are useful if you can accommodate them.