It is more about the adventure than any time I can think of. A robust and well designed system that is able to withstand implosion means more games going to higher level.
As a DM, I feel more impowered to challenge my players than any time in the past, definetely more than in 2e. Talk of leveling, builds, and magic items are default, common ground things to talk about. Hey I have been a gamer for over 20 years now, and frankly the last thing I want to here is the sterotypical gamer showing me an example of his barbaric yawlp, and how he and his group braved the evil forest of leporus tree sloths to rescue the fair princess, that turned out to be a cambion.. and then they had to fight her AND her mother who was a half dragon Half demon that had destroyed the ancient Sun elf kindom a thousand years ago, removing the curse of lycanthropy of from all the werewolves in the world, who were really Sun Elves, and how this one time at band camp......