I understand the frustration with human players in open lobbies (at least console, no idea if better/worse on PC). But part of the point I've been trying to make is, casual players (at least some of them) turn into sim players. Did it myself. Pretty sure the vast majority of sim racers started out on a more softcore game. The fewer casuals playing PC2, the fewer turn into simmers.
And don't poo-poo GT so bad. Before there were decent hardcore sims, the same decent clean drivers that now populate iRacing and ACC or PC2 raced WRS or SNAIL Leagues on GTS. And you didn't hear them bitching about dirty public rooms. That's where they came from, originally!
The game allowed them to easily set up, label, password (if desired) and host clean rooms. If it could be done on GT, it can be done on PC2. But only if the same tools GT had are given to hosts in PC2.
I do NOT believe that GTS is the more popular game because it is easy to drive... All SMS have to do is allow grippier tires (GTS has no problem allowing noobs to stick racing super softs on a Fiat500 if that's their comfort level) and that issue is solved. And they need to completely redesign their lobby system. People play GTS over PC2 because it is MUCH easier to get a quick online race, against people with the same skill level and intentions as they have.
TBH, I find GTS much harder to drive well on than PC2. It's Zamboni racing, even on softs. I truly believe that, address the lobby design issues, we'd see a huge upswelling in PC2 numbers. It's not PC2's physics or handling that is putting off the majority. It is that, once you get used to it, you have two options. Join a regulated, regimented hardcore league and endure being told what to drive, where to drive and when to drive, or resign yourself to racing the AI. With no tools in the lobby system to set up good clean casual rooms, that's it, baby!
So they stay on GTS, even though they would LIKE to step it up. We need those players.