If you give someone your email instead of your AIM then there isnt more to remember. You would email each other instead of using an always on messenger service. AIM was a place you logged in and logged out of, and all conversations were contained within those signals. It was a
different experience which made it something worth remembering a new username for. If we take away the signalling that made it different than email, then why use a messenger service at all?
The current messenger systems seem designed to increase expectations, and then we wonder why people expect too much. they offer things like "online, away, busy, offline" but in reality no one cares. It all ends up just being part of your pile of notes that you will respond to when you can. So it might as well be email, which is built around that level of expectation.
I mean, I dont mind having to remember separate email and messenger accounts. I am just saying that if you are going to bring it up as a problem, then the solution is to drop messenger accounts, not email, because they barely provide anything new anymore over email except ambiguous expectations and stress
Also, I'm not sure why that point came through like a quote, it was just the point I was trying to make.