[locknitpicker]

> I think the universe of SPAs that should exist is far smaller than the universe of SPAs that does exist (...)

That's a pointless thing to say. Your personal opinion on how people should not use a technology weights nothing on a discussion on how the whole industry actually use said technology. For that to hold any value, first you would need to argue that you know better than the entire industry put together, which would be quite the claim. Occam's razor doesn't favor your statement.