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 lose 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 via WhatsApp.

P.S. Shameless plugin for /m/Signal