While releasing in PC would get extra buyers I don't think it would make a massive difference tbh
If you can't sell where your fanbase historically is I don't think you will sell well elsewhere
I would understand the thought process if the JRPG audience have gone away from Playstation, but still by far the best platform for JRPGs so it's not a platform problem. Maybe in Japan where JRPG audience was always divided between Nintendo and Sony, but even if this was the case Sony could not make FF VII run on Switch so... yeah
Now a hot take. FF XIV is far and away the most popular thing Square have so far and it have an audience completely different from their other mainline games
Maybe the future of FF lies in more PC-centric releases. Not MMOs, but games developed with PC gaming in mind. The audience for western RPGs is pretty big. Maybe it's a smarter approach to go for them instead of releasing the 46731872th Action RPG in the market