I'm clearly not in the demographic that gets to answer, but in proactive response to the silent reason holders:
I do think many of those reasons were good reasons not to play on PC not that long ago. This last big wave of games really invalidated most of them, at least for most cases. MK11 patching and quality were lagging behind the main game, but it really has been the odd man out. There are a lot of the big fighters that have had good release parity with consoles, and in a lot of cases get time content unlocks first.
Performance wise, PS4 has had to repeatedly address a tendency for additional input latency not found on PC. It's something that has helped make a couple games on PC considered "best" versions even if more population exists on console. If you wander into a high level Tekken or SC6 stream, there is a strong chance they are playing on PC. I don't think it moved the needle much but SFV some people started playing on PC because the jank netcode changes seemed to hurt the PS4 while improving the PC netplay. (Not sure where SFV fits these days)
Latency does play into the "play the standard" argument, since it can change meta a bit. I've heard streamers talking about meta shifts in things going from reactable to guessing games for DOA and Granblue for them. PC's don't make for great tournament setups, but nobody is standing up rooms full of PS4's right now either.
On the negative side, even when a fighter is best version, you can't count on the other player having a good setup, which could impact your experience. When people complain about performance issues, there are also lots of people to let that person they should stop playing on a potato without actually knowing if they have one. It makes talking about issues extra difficult. More configs, people not really knowing how their PC works, and extra ease of access to cheating.
At different times, I've been more and less comfortable just playing something on PC. I generally like being there because I'm already at my PC and I can be doing several things at once. It's good for playing all kinds of games where as a console isn't ideal if you want KB&M. If someone's PC is old, and in a dark corner of a far room then picking up a wireless controller is probably much easier to jump into, so I get that would be a big factor I don't fully relate with.
Cross play is in a weird place. It's been done, but if a platform is going to get left out in the cold, it's PC who would arguably benefit the most from it.