Star Trek has always been more about diplomacy than violence.

It is a trek between the stars, not a war.

That said, it contains action, but it wasn't the main selling point.

Very much so, yes. That's what turned me off of Picard, for instance (and the whole "Earth is back to being a shithole after a single android attack" thing).
The very obvious subtext of every good Star Trek episode and plot is that just talking things through is a good way to solve most problems. Newer writers don't seem to have gotten the memo, and instead try to cram as much generic hollywood garbage as they can into the series.

yes.

That's only an issue with some of the new trek series, not the classic ones from last century. I'm not really concerned with paying attention to the new ones at all.