The migration caused a large jump in the amount of users, and with that you will have disorder and confusion.
But in time, the communities/magazines where people actually congregate in will rise to the top of the lists. That's where you can find the most active discussions. Even now I found myself unsubbing from some of the quiet kbin magazines I found on my first day and subbing to the bigger communities on beehaw and lemmy instead, which works for me because I want that feel.
The beauty of duplicates is if you find that you're being drowned out, you can go to a place where you can have more of a voice, and discussions will be slower paced, or you can start your own. Most people crave simplicity though so realize that not every alternative will be alive; some of them are veritable ghost towns.
With regards to kbin.social itself, I like that it's relatively open and neutral, instead giving users the access to block users/magazines/communities/whole instances as they see fit. As far as I know it hasn't been deferedated by other instances yet, and that's great because you can reach most anything in the Fediverse.