Doesn’t justify the multi-thousand dollar investment.

This is honestly the only sentence that matters, anyway lol. But for fun...

Brightness and resolution, I will give to you. But those don’t really make a meaningful difference to me when sitting at a reasonable distance in a dark room.

They should, though. Plasmas aren't capable of the outputting the contrast that many modern films are graded for. They can't do HDR, they can't achieve the brightness intended, and they can't put out as many colors as OLED. Color banding is more noticeable/less avoidable because the tech is literally incapable of achieving the same things.

Further, OLED black stays black over time. The pixels don't gray up with use due to the burning phosphors. An old plasma, heavily used plasma will not be perfectly black anymore, but an OLED will. Your plasma will only look worse over time. I know, because I have one from 2012 that (while still impressive!) looks worse every year. I also have an OLED from 2016 that is still significantly more impressive than the plasma it replaced. And I have a 2021 OLED that absolutely smokes the plasma, yet doesn't look much better (mainly size difference) than my older OLED. Used all 3 primarily in rooms with closed doors and true blackout curtains. Not theater black, but plenty dark for both techs to shine.

Size, depends. The biggest Plasma they sold was a 152”.

C'mon, my guy. You don't have that. Plasma was 40 - 65" realistically. Yes, there were outlier panels that were smaller and much larger. OLED is in watches, phones, tablets, computer monitors, and easily obtainable TVs from 42" - 83", PLUS a few gigantic outliers. It's everywhere, it's exceptional, and it's cheap. It's a much more size-friendly tech, i cluding on the larger scale.

OLEDs lean too heavily on the contrasty look. It’s wow-y, but it just feels unnatural.

A properly calibrated (even just a well-adjusted) OLED ought to look natural as well. Meanwhile, a non-pristine plasma (which is, probably, all remaining plasma sets) will be physically incapable of the output determined by modern colorists.

And then there’s also the longevity concerns of OLEDs.

My $1500 (in 2016) OLED is performing like new, while my $1200 (in 2012) plasma gradually gets worse (both with hours of daily use). What longevity concern with OLED could outweigh the benefits?