It was Google that championed 2-step verification a decade ago (2011), including SMS message as an option. I presume few people anticipanted sim-swap attacks at the time.

"After entering your password, Google will call you with the code, send you an SMS message or give you the choice to generate the code for yourself using a mobile application on your Android, BlackBerry or iPhone device." [1]

Until someone comes up with a SMS 2FA alternative that is simpler and easier than all the SMS alternatives, then SMS 2FA will continue.

[1] Advanced sign-in security for your Google account (2011) https://googleblog.blogspot.com/2011/02/advanced-sign-in-sec...