I prefer a slight barrier before I'm interrupted and don't mind paying the cost of sending a message. On top of that I don't like non-regulated foreign companies looking over my shoulder. That this is a non-standard pattern I'm well aware of but it suits me just fine.
If you're on a pre-paid plan then SMS doesn't just cost money. It's actually a finite amount you can send before you need to up it. Whereas Whatsapp can function on WiFi. So that can be a big deal if you have urgency.
> I don't like non-regulated foreign companies looking over my shoulder
I mean sure. You have to trust Facebook that the end-to-end encryption has no backdoors. But SMS is known for being intercepted really easyily.
Now that I think about it I’m not sure if “apping” implies texting, voice call, or video call. Lol
The only time I get an SMS now is for specific multi-factor authentications or automated updates from companies. A lot of businesses even do their live support through Whatsapp now.