People don't know what choosing a server entails, because it does matter and a lot of people aren't exactly helpful when they say "just pick any" or "it's like email"

Server choice matters because:

1. Server might federate with a limited number of other servers;
2. Server might be blacklisted by some servers which you might want to interact with;
3. Servers can be running different versions of software, so people might think about security;
4. Servers can go offline
5. Server choice can significantly impact how people perceive you. "Oh look, another tankie from ml"

So, server choice matters and people coming in from corporate shit don't know how much they need to know to make an informed decision, thus giving up.