Often times people have resolved all the rational arguments to act on a decision but lack on an emotional excuse to figuratively pull the trigger. I’d bet on someone high up had already made if their mind and you not using WhatsApp was the perfect excuse to just have the whole team finally migrate.
Yes, you can share location, the widgets aren’t as fancy as Google integration with everything.
Not feasible without the constant data harvesting in the background, which it doesn’t do. It doesn’t log your every move as Google does. Privacy vs surveillance, will always be at odds.
Depending on the area. In my country public transportation is way better on OSM than on Gmaps. Oftentimes Gmaps won’t even have large structures like train stations or bus terminals. It depends on users and contributors.