Some of us are doing both.

In signal, You can turn off phone number visibility and make it so that you are only searchable by username or qr code. Yes, it’s centralized, but signal is a nonprofit project with generally good guiding ideals. I use matrix for some things and signal for everything else.

Can confirm. I worked as a contract program manager for Microsoft with O365, Azure Gloval Ecosystrm, and yes, the dreaded Windows team. I wakk out out my last two Microsoft jobs in the middle of a shift. I would do it again.