Yeah, that's the real "internet explorer of messaging services". Absolutely sucks to use it (doesn't even.deliver messages to me half the time), but 90% insist on it for chat groupa and such.
I do have like 2 people I only talk to once or twice a year that I don't have any other known contact for. But I only use it very rarely because of that. If I ever stop talking to them, I'll finally delete the whole account.