Also the question is would fans accept Jon singing songs acoustically? Or not singing songs? Or badly singing the songs?

Livin' on a prayer makes sense acoustically nowadays, but Jon knows fans prefer the non-acoustic so he sings it. Always, is another example I like Acoustic, but fans don't like that so he sings it as the fans want to hear it, even though he knows he can't sing it. Of course there are many other examples.