for me the step up is mostly about wanting even more tracks and modern race cars that GT7 doesn’t offer. Between iRacing et al, and with more sims coming down the pipe, there really won’t be a track or car that isn’t available to run.
On my side, I don't care about more tracks, more cars and I really enjoy the great ease to use PSVR2 on PS5. GT7 is beautiful too, even in VR, not all PC titles can do better, most of them focus on other aspects (like being a more realistic sim). Plus I have a great community of buddies with whom I race every week.
As for the cars, we use a wide range of them and rarely the pure race cars, often stock or with little tuning to make them more enjoyable to drive.
There are a lot of little things that could be improved in GT7, sure, in particular in lobbies, but we adapt and it is not an issue when the race is going on.
I use VR on PC too (ACC, MSFS2020 with a Quest2 and now with PSVR2 and an adapter), and it is sometimes a lot of works to make all stars align. And at times it stopped working entirely and it took me weeks to put it back in order (mainly due to procrastinating the "repair" because I was not motivated enough.
I have to admit though that some good PC headset with pancake lenses, high resolution are tempting, but I'd need to upgrade the PC too (currently on a Intel i7 with 32Go of RAM, RTX 3070, SSDs...)