I don’t think ConcernedApe does the console and mobile versions, I would assume he got back to Haunted Chocolatier after 1.6 dropped on PC. Pretty sure he licenses the porting process.
Most people have just two speakers, and if you have headphones a good stereo surround software can actually be even better than the surround from multichannel
I don’t think it’s possible to play the current game single player (offline) meaningfully. But there are very regular free fly events, I think you barely just missed one. I’m not sure I’d really describe it as worth it regardless for most people right now, it’s still very alpha and has a very steep learning curve to actually work out how to progress on your own. But it is a beautiful thing to explore still.