And Facebook isn't? Gmail tabs work pretty well for me. Yes, a lot of email comes in but my Primary tab is relatively clean. Email is still my primary communications method for home and work with texting in 2nd place for more immediate needs.

Added: What email was/is bad for is the family member/friend who just had to share jokes, what we call memes these days, etc. with 100 of their closest friends on a daily if not hourly basis. Facebook etc. have largely replaced that sort of thing and that's for the best. But sharing baby pictures with the grandparents? Email's is fine, even best, for that.