Agree with the general consensus saying no to default communities. Maybe a “recommended” list that it displays for you while you’re still new (like… maybe until you have 5-8 communities subscribed to) but I don’t think you should be forced into certain ones at the start.
Kinda like how Apple often makes terrible decisions that everyone hates, and then every other company follows suit because it actually worked and it’s been normalized now. Musk made all sorts of garbage decisions and didn’t lose critical mass of users, so now every other social media company is gonna follow suit now that the terrible ideas have been “normalized” by one of them.