i can give one reason of mine. i left 1.e4 e5 because of this line
despite nc3 is worse than a plan with c3 and d3/e4 is not exactly exiting for black and in addition this Nc3 seems to be recommended to beginners by many players making it even more popular for white. so i left 1.e4 but came back after a few months because 1) it was just about the only line i dont like with 1.e4 e5 and 2) no matter what openingmoves i play there is some way to kill the fun anyway so i just stay with 1.e4 e5
it seems most chessplayers start out with 1.e4 e5 but most people start other openings at their opposition gets better.