The observation that “MCU movies always end in a big fight” is accurate, but phrasing it as a criticism is a little ridiculous. Yes, the action movie is going to end with an action scene. That’s the genre. It’s like complaining about how musicals always end with a song-and-dance number.
But the actual criticism in the Superman thread, which @Chronos was originally responding to, wasn’t “always ends in a fight,” but more specifically:
Which was just a general comment on what kind of stories make good stories. A second poster said that described the MCU, and Chronos correctly pointed out that it’s wrong, and that a lot of MCU films don’t end with the hero successfully overpowering the bad guy, even though there’s always a big action scene in the third act. (Because, again, they’re action movies.)