A bit weird for the "I don't use it so who cares" view to take a firm hold here.

SMS is:

1. not controlled by a single company

2. a different network than the internet

3. a fail safe for people who don't use apps or are unable to at a given time for some reason (inc 2fa)

4. a fail safe for a "small group of people" who are suffering the consequences of a natural disaster.

Though perhaps not economically feasible for certain companies, supporting redunancy is as much an honorable goal as privacy.