I won't even install things like WhatsApp, so there's nothing for me to ignore unless I just delete my SMS app. That's how people reach me since I don't even have accounts for the apps they use (mostly SnapChat, Instagram, and Facebook Messenger in my age group.)
Discussion
SMS is actually good.
That's a broad statement. It's not good if you don't want the phone company (and anyone else who can have access as a result) having a complete record of every conversation you have through messaging.
It's not good if you want some features offered by modern messaging clients.
It is good that it has been adopted as a standard.
If you just want to tell someone hey in a standard way and don't give a damn who sees it then sure, it's good.
Ok, you are right. They are awful.