Perhaps this is my fault, but for someone who spent the last 2 years enforced solo, if I could have got solo rpgs to work, that would have been great.
And I think the reason is the same as why the online versions don't feel as good. Actual interaction is a part of most RPGs and to people like me, what makes them so good.
For my personal solo stuff, - I wanted a particular set of mechanics, I wanted the "crunch" part (character optimization)- which something like solasta can replicate, and I got it. It was "ok". It's just it didn't get a second play. It turned out, for me, that the crunch, exploring the fluff etc- even though you can replicate it solo, feels like a poor shadow.
I mean, for the last 2 years I would have been ecstatic to find a brain release /decompress mechanism that worked as well for me as in-person RPGs.
Not meaning to cast solo stuff as "not real" or lesser in any way. I did a bunch of solo dungeon runs in Adnd 30 years ago. But if someone is running solo and haven't tried groups, don't have the confidence to reach out to a group, I'm not sure what re-assurance can be given. RPG.net, enworld and other forums seem much more prickly than the folks I have met in RL gaming. Not sure how to help with that.
