It depends on the subreddit as well. There are some where discussion is expected. /r/nbadiscussion versus /r/nba, for example. The former will get into some good discussions if there’s a player looking to be traded. On /r/nba, you’ll get a bit of that but you’ll also get a few dozen, “He gone,” comments.
I appreciate both at various times. I go into /r/nba specifically for the funny takes and will go to /r/nbadiscussion when I’m feeling like reading something more. That said, even /r/nba can get into some pretty impressive posts with stats, diagrams, and excellent breakdowns. It just depends on the day.
I think the funnier times are where you expect one thing and get another. I can go into /r/guitarcirclejerk expecting some light hearted shitposting and end up with a great discussion on one thing or another.
I think changing the default view for content and communities would help. Branching off is one thing and there may be a valid reason for the split. However, I wonder how many current duplicates are accidental. The current setup for Lemmy is to view Local communities by default. An intentional creation of a separate community for a reason is one thing.
Fragmentation of the communities will probably end up happening with time but I don’t know that it’s best to have things fragment early on when communities and those identities are still, in some cases, in the early stages of development.