I agree. Now I'm less interested in looking at running times and more whether the content requires it. Just because something is "short" doesn't make it good (and vice versa). The problem here was an uneven, at-times misconceived story arc that had too many characters going for no good reason half of the time.
The irony is for a season that was bloated, the finale itself -- just like the third season's -- wasn't at all. In fact I'd argue its 2.5 hours were better paced than any super-hero crap of similar length I've watched over the last few years, THE BATMAN especially. Clearly they know how to package a "movie sized" feature and they construct the story so that it leads up to big dramatic moments -- and then they deliver the goods. We started the finale relatively late last night, thinking we'd watch it in 2 parts, only for it to keep us invested and we finished it all in one sit. It was nicely balanced, it was well written, and it never felt boring at all (IMO). I mean, I'd sure as hell rather watch a big epic climax than some "generic 40 minute Disney+ finale" that isn't even constructed like an episode, more like a long show they've sliced into separate, sometimes arbitrary parts.
It's what was leading up to that -- just too many characters, too many needless plots. Inbalanced writing. Too much gore out of the gate, it felt like it took a couple of episodes for the show to find its actual rhythm again. That's more the problem for me. Millie Bobby has been complaining about how they don't want to kill anyone off, but she's right in that -- plus you can write people OUT even if you don't want to kill them off. There's just too many characters that they diluted the two main strands this year, 11's story and the Hawkins gang -- everything else just felt like it could've been tightened up or eliminated together.
The Russia stuff as we've said before sucked. Badly conceived right out of the gate, a mistake. Honestly Hopper could have died (or spent the entire year "in the void" so to speak) and it would've been OK...you could have worked this season into 11 trying to find her place, and powers, on her own again after his death/disappearance. You know the whole "I can do this on my own" or "I have my friends still to help me" thing. And if you ARE going to bring him back, why not save it for the last season? And certainly minus the dreary "Joyce is springing him out of a gulag" plot.
I was thinking that -- okay so they don't want the characters to die. But how dramatic would it have been if they wrote some of these characters out for 4, then brought them back in 5? Instead they spent time developing one new, likeable character -- only to kill HIM off.

I don't think their writing ability is quite up to their technical talents -- and/or they should hire some other writers to work with them.
I mean, was Wolfhard off shooting GHOSTBUSTERS during this season? Mike was utterly
useless. Like the entire season he's in a van. Most of their scenes -- the comic relief element notwithstanding (which you DO need) -- could've been tossed like the Hopper scenes. Just not needed.
Overall there were some fantastic moments and I certainly still enjoyed it, it got its act together and the final third was great. Hopefully they reassess what kind of didn't work and pull it all together for Season 5. A little time off will probably help them in that regard.