The only large group of people who still primarily use SMS to communicate person-to-person is Android users in the USA.
Every other country has settled on either Telegram, WeChat, WhatsApp or FB Messenger, or other niche apps. These apps work on both iOS and Android and often also Windows. I haven't sent an SMS in probably 12 years. I don't know anyone who has.
It's only in the US that iMessage is so prevalent that Android users have to use SMS, the only other way of messaging iOS devices. And the US is quickly becoming a de-facto iOS only country. It already has more than 50% market share, even 80% among young people.
With the US going (almost) full iMessage and the rest of the world having already settled on another app there simply no point to supporting SMS.
It became common to get atleast 1000 sms in your plan, combined with maybe 100mb of data back them, then unlimited sms with 1gb of data, and then slowly data went upwards while sms can't go up from "unlimited". 100MB is not enough to leave "the internet" running 24/7 on your phone, so internet-based chat services were unusable for general reachability back then (we're talking about early symbian and stuff like msn messenger era), and you just sent an SMS (becase 1000 is enough for everyone... except teenage girls back then(.