> Something isn't better just because it has more features
You're right, but being able to be spammed with a string ID absolutely is a positive feature. While your inbox may annoy you, I'm sure you also use to sign up for services, get marketing info that you're interested in, get billing notifications, etc. Could Messenger do all that? Yeah potentially, but now you've just moved the spam problem into Messenger. That's why I'm saying Messenger isn't the better tool because it doesn't have spam, it doesn't have spam because it lacks the features that introduce spam.