You're contradicting yourself. LAN is great because it's basically the same experience as Online eg you have your own screen and your own "cockpit". LAN has absolutely nothing in common to split screen other than the fact you're physically in close proximity with other players, but that's irrelevent because when you talk trash without a mic it's same as talking trash with a mic. Nobody leaves their station to walk over to another player to get touchy feely LMFAO...
It may be fun in the sense that it's like a party where you can grab a beer and BS but it lowers the immersion factor of the game experience. I mean think about it when I'm driving a race car I don't care what other peoples' POV is, it's useless and just lessons the immersion whether or not there is a perceived advantage for the player.