It seems like that's not really going to work for the developers of these apps due to browser variation and version skew? (If it were okay, why aren't they supporting web browsers already?) But maybe apps on the same version of Electron could share a runtime?
Discord, to take an example, does support running in a browser. It's how I usually run it.
It also comes as an Electron app, because it wants more system privileges than browser tabs are ever allowed to get -- to tell people what game you're playing.
Web developers are already accustomed to supporting much more widely-varying browser versions, and web standards are expressly designed to be backwards-compatible basically forever. I don't think it would be a major problem.
