Since this is MMO, the point of playing is to join LS and make friends. If you don't have ls/friends already, just make it happen. So this argument of "can't get anything done unless you have ls/friends" isn't quite fair, IMO.
Also when it comes to harder content, LS/groups/friends are far, far, farrrrr more efficient than PUG. Moving to bigger server just to do harder content with PUG is efficiency decrease, not increase.
Smaller servers generally have a tight knit community in ls/friend circles, with pretty strong social connection because everyone (has to) do everything together, and they're very willing to help others. There is a reason why someone in this thread can't get into groups/pug on Asura but totally capable of doing so on Carbuncle in his connections. He's basically competing with 1700 people every time a DD slot is opened in yell, and it's not exactly easy to get in.
I mean, if you like bigger servers and play with strangers all day, while competing with a pt slot against REMA BLUs, by all means go for it. Why do you all have to bash others for preferring smaller servers?