That's been my experience as well. Facebook/Hangouts/WhatsApp/Allo/whatever might have amazing features but I truly don't care. SMS/iMessage (since it's seamlessly integrated) has completely taken over with my group of friends because of one defining feature - everyone has it. If you have a phone number, you can receive a text from me.
A while back one member of our group got tired of the 8 person running group thread we have and suggested moving to something "better". The group unanimously shot it down because we don't want to download new apps, create new accounts, then inevitably have to migrate to the brand new flashy service in 3 months.
For context, we're all late 20s/early 30s.
Edit: Actually, I believe SMS is still superior because it works even without a data connection. We spend enough time camping, skiing, attending huge sporting events, etc. any of those other services would be a significant downgrade.