We're talking about what the most animated (typically most expensive) portion is.
No, a great action scene conveys the story, the characters, and the production values within that scene.
It's more of the entree or the main hook if it's great because it's what the episode builds up to or maybe even kicks off to set the pace.
I'm thinking the late 90s had most of the best fight scenes, given Godzilla "Zilla" got its own show to thrash around a new monster each week. Before that, since the 80s, you mostly had a ton of shootouts, laser light-shows or a bit of swashbuckling...and also Peter Chung.
Not always, for example a Batman vs. Scarecrow story is about psychology, not action. Batman can take Scarecrow in a fight, all day every day. But Scarecrow exposing Batman to his fear and Batman having to stop Scarecrow from blanketing the city in his fear gas, that is not a problem that can be solved with fists. Same deal with Batman vs. Riddler, it's a battle of wits, not fists.
Or look at Ghostbusters, usually the Ghostbusters just zap ghosts and trap them, but some ghosts are immune to their weapons and the Ghostbusters have to find a different way to defeat them. There it's about figuring out a puzzle, not using karate to subdue a ghost.
If the new Nick Star Trek show is just about blowing up Romulan warships and nothing else, that misses the point of Star Trek.
A cartoon with great action and nothing else is like a movie with great special effects and nothing else, all style, no substance.