Well your account is on lemmy.world so how d’ya know the issue isn’t with your own access to the front end?
Many don’t interact with the lemmy.world directly, so we might only see delays in post propogation (if there is such an issue on the backend - I don’t see any but could be wrong).
I agree picking the biggest instances isn’t great from a scaling perspective, but s’gonna be hard to move any community once established.