To be fair, no. (People do switch between "low key pure-R" jobs and "higher stress r&D" jobs. Perhaps similar.)

But... perhaps this is because after you've made $industry_money for 10 years and hit your late 30s, you realize you'd rather spend all of your time training your biological AGI agents and don't really give a shit about the kinda unpleasant industry rat race, much less the totally brutal higher ed rat race.

Or skiing. Lots of multi-millionaire ski bums in my grad cohort. No idea what they do in the summers. Not my cup of tea, but probably better than writing papers no one will read.

In early retirement, there's time for research. And time to share that research. Just... no incentive to do the rat race thing that's necessary to convince an academic you're "accomplished something". But who cares? You finished the race. You don't have to get paper awards or NSF grants. You just have to do work that matters. Or ski. Or change diapers.

So, I guess, to be even more fair: yes. CS PhDs work through their 30s and then retire. Totally. All the time.

That's not too different than what I did. I left Google fall 2018, at the time thinking I'd write a video game. That morphed into doing research on 2D rendering, because building the infrastructure for that was more interesting and exciting than the actual game. For a while (not the whole time) it was pure unstructured time, no outside responsibilities. I rejoined Google a year ago with a research software engineer title, mostly because it was a better place to pursue this research than just continuing on my own.

Partly I'm posting this to support 'lapsedacademic's assertion, you can do good research in industry. It takes a certain element of luck to land a spot, but it also helps to be very passionate about the research itself.

I'm now writing a paper on an exciting GPU algorithm, but it's pure love, funding doesn't depend on it, it just makes a nice point on my list of accomplishments during perf time.

A friend of mine did! He's been pretty productive, both in terms of academic things and living a good life.

CS is nice in that you don't (initially) need access to a lot of resources. I think this would be much harder to do in a wet-lab field, which is one of the reasons I'm still here.