The rest of the world isn’t interested in a one-stop-shop for anything and everything.

I’m not entirely sure this is true. Look at the constant posts and commenting on how people hate to deal with the complication of additional apps / sites. It’s a major negative of the fediverse, it’s one reason I think Signal shot themselves in the foot getting rid of SMS. It’s why people keep using Amazon or Netflix even as they get worse and worse and more expensive. Heck, I’m not even immune - I wish we had one fast and cheap way to transfer money rather than Zelle, Paypal, various bank schemes, venmo and on and on. I wish we had a universal shopping cart thing like Paypal checkout more widely adopted vs making ever more accounts and typing in all my details for a one time order from a different website (and this is one reason why people gravitate to Amazon vs individual sites).

I’m not saying I’d like an all in one app, but I can see it potentially being interesting to people if it simplified their lives. I don’t think Musk and X are likely to be able to do it, but I don’t actually think there’s no interest.