Yes!
JWTs in the browser are a total pain. You need a way to revoke them (when a user is fired, etc). Or you need to make them crazy short lived (5 minutes). Users need to stay logged in without the tab open for a lot longer than 5 minutes, so you need a way to make that work. They tend to be really large, which slows down your load times a lot due to TCP slow-start and people just having weak upload speeds. And they can easily get too large to store as a cookie. Also, people forget that anyone can read the data stored in the JWT. They just cause more problems than they solve and there's a lot of edge-cases and footguns.
Old links to your site might still be http - HSTS prevents that request being in the clear. Also, if you have a man-in-the-middle attack, it doesn't matter if you return a redirect or not as the attacker has already replaced your site with a phishing attack instead of a redirect. HSTS prevents this.
It does sound like each server is its own process. I think you're correct that it would be a little faster if all games shared a single process. That said, then if one crashed it'd bring the rest down.
This is one of those things that might take weeks just to _test_. Personally I suspect the speedup by merging them would be pretty minor, so I think they've made the right choice just keeping them separate.
I've found context switching to be surprisingly cheap when you only have a few hundred threads. But ultimately, no way to know for sure without testing it. A lot of optimization is just vibes and hypothesize.
I think the jist of it is, you probably have sufficiently low requests/second (<1000) that using postgres as a cache is totally reasonable - which it is. If your hitting your load tests and hardware spend, no need to optimise more.
Weirder still, the discounts stack! So blind people can benefit from buying a black-and-white TV for an additional discount.
I've given this a lot of thought in the past. The best I could come up with is that "legally blind" could still allow for someone with _very poor_ (colour) vision...