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Samsung joins Google in RCS shaming Apple
(www.theverge.com)
This is a most excellent place for technology news and articles.
They are incompetent enough. They also see no reason to switch. They will tell you that other apps will also use your data and that Whatsapp is working fine for what they do with it. Doesn't matter if it's true.
Some even use the status to share stuff like Instagram and are addicted to it.
They'll tell you that there's no point in installing two apps. I've had that topic often enough.
You originally said nobody was skilled enough. It seems what you really meant is nobody cares enough.
Unfortunately, that's the actual reason in my experience. I got most friends and family to run Signal next to WhatsApp though.