Let me explain how it works when you self host like me:
- "All" starts out completely empty, there are no federated instances to find this way.
- You then have to browse communities on other instances and subscribe to them on your own instance. Only then will posts start showing up in "All".
- Since there's only 1 user, the list of communities in "All" is the exact same list of communities in "Subscribed"
For most people yes, you can just browse "All" unless you're on a smaller instance, since someone on your Instance has probably already subscribed to the community you're looking for.
I can't read what you mean if you just insult me instead of attempting to communicate better. Clearly we have different views on this. I'm pretty sure I'm not misunderstanding you, I just think your argument is unproductive and pretty much in-line with the saying "perfect is the enemy of good"