I hate this. If I know the password I should be able to log in to my account no matter what (unless if I have 2fa enabled). Sadly companies like Google and MS do not like this idea, they also often use the excuse that they can't verify you in order to mine your phone number. "Edit: Account recovered. I used chromium to login (which I never do) and then back to Firefox" How can google keep getting away with this? MS g…
The request for a phone number is precisely a 2FA mechanism, and that's how it's being used. I don't understand what the bad faith you're assuming on Google's part is. What do they want that phone number for otherwise?
If you're not trusted, then any phone number you give shouldn't be trusted, either.
If you're trusted enough to be let in when you give a phone number, then you should be trusted enough to be let in without it, and then asked for a phone number, if one is really needed for 2FA.