I'm surprised it took this long, given how insecure SMS and MMS are.
On the other hand, I don't think I know anyone that uses SMS regularly, so maybe it just wasn't a priority? Pretty much the only SMS messages I get are automated. It's more common to see people using either Messenger, WhatsApp, Signal, or Telegram (or iMessage in the USA but that's mostly an outlier compared to the rest of the world).