Experts know this (because it's obvious) but large companies like Google continue to insist on using it either because they like the data collection or because they're just covering their asses.
If I'm giving advice to companies, I say "don't use SMS 2FA as 1FA" (well, I actually say "don't use SMS 2FA at all, it's too tempting for a support person to use it as 1FA"), but this thread is about the user, and as a user, you shouldn't use SMS 2FA.
So you are not against phone based 2fa or 1fa, your are against giving companies your phone number. But them, if they are soooo careless to try phone based 1fa when they can get away with it, they are also probably open to some social engineering.
In the words of RMS: "We should all try to make those companies fail."