Lost a bunch of contacts after ditching WhatsApp a few years back but eventually managed to get most of my valuable ones to use Signal.
Work-wise everyone uses WhatsApp, for example my team has a group chat that I am not a part of, so I am losing some info on that side.
When traveling I also get a lot of prompts to use WhatsApp for example two hotels we stayed at this year did concierge only via WhatsApp.

P.S. Shameless plugin for /m/Signal

Plastic thingies on laces

It seems that they only had it running for a limited user base, they are rolling it out to everyone now.

Can’t wait!