I don’t consider it weird for someone to stand against something that’s normalized

I mean, I agree with that for some things. Like I think its fucking weird that people do celebrity worship, but that's also considered pretty normal.

but I think in the case of using your phone number to sign in, it's normalized because its been shown to work as a log in/sign up method. In the US phone numbers are treated like a form of ID as you're assumed to have a phone in your name, that can be attached to you and your identity. It's so common place that it's encouraged to do things that way - so its weird to draw the line there because its then also preventing you from using something, even though the only hold up is that it's something most people do with no issue.