Not OP but I think I've participated in a group SMS maybe twice in 10 years and initiated none. I don't feel like I'd be missing out by not having group messaging support.
The problem is, you have no idea if you're missing out because you aren't getting them.
I use Google Voice and my family uses group text to coordinate things like dinner. I only knew about dinner because my wife gets the group texts.
GVoice eventually fixed the group text problem, but I don't get all the messages and I get them out of order. I also get other group texts with important info that I wasn't getting before.
I have no idea how many other group texts I'm missing out on that I might actually want to be a part of or was missing out on. Everyone assumes that group text works with all recipients all the time, and since it has no way of telling the sender it failed to deliver, no one ever follows up.
Depends on geography. In Canada it’s WhatsApp and Messenger groups. Never had a group text. Not saying it’s the same across the country but don’t assume that other are missing on group text, I could get group text and I don’t.
Does group SMS even exist? I know that you can send the same message to multiple recipients, but does it support "revealing" the recipients to each other? Or am I just out of date? I haven't sent a proper SMS in probably 5+ years.
It's extremely common in the USA since most people in the usa have phone plans that include unlimited MMS and SMS, third-party chat apps like WhatsApp never became ubiquitous here as a result of that basic functionality being available through the phone.