Moonbeam says:
Well, at the other end of that spectrum, we have the DM of the one and only Roll20 game I once played in, who wholeheartedly believed that HE was telling a story and the players were just tools to help him express his vision. He regularly complained that we were too powerful whenever we succeeded at anything and would do all sorts of punitive stuff to us in fits of pique. I gritted my teeth to finish that campaign because we had a hard end date and I didn't want to create drama by flouncing. In the final confrontation with the big boss, he had another NPC (kind of a mirror universe "good" version of the big boss) engage in direct combat with the boss while the PCs were on the sidelines throwing magic and crossbow bolts. The NPC ended up killing the boss and dying in the process.
^
I've read so many of these stories and I guess I'm a bit overcompensating by letting the NPCs take too much of a backseat sometimes. I'm worse in IRL games because I already have so much to juggle that I often end up forgetting about/ignoring the NPCs.
I'll try to be better about it at least here in PBP where I can take all the time I need