[dathinab]

Like people you don't want to have contact with but have your old number being remained that you exists and starting to annoy or harasser you again.

And pleas don't respond with "you could just block them" that not in line with how the psych of many, especially vulnerable people work.

Also pleas don't respond with "you can just change your number", for many people changing their number is hard which again for some vulnerable people can mean it's basically impossible.

Sure it's not a "my whole live will be messed up because of it" feature, but it easily can be very very unpleasant.

Like as an harmless example I know someone who completely changed their live and do not really want to have contact with anyone from their old circle of friends (not because of them being bad people, but because of the memories this includes). But they are to polite and insecure to outright block them, similar changing the number isn't an option for them. And guess what happened recently Signal told me: Hy person X joined Signal. I knew better then to contact them, but I wouldn't be surprised if this caused them quite a bit of distress/discomfort.

Anyway, I'm fine that people which have my number can write me over signal, or that their app knows when the number is changed, to warn if the old number is used and hint at you when you try to contact the old number. I'm not happy about Signal (and others) actively telling everyone "Hy this person did [join|change number]". It's unnecessary and for some people harmful.