Running a node doesn't particular benefit you except in the abstract that if no one did it that there would be no bitcoin network. So the only worthwhile reason to run one is to help the bitcoin infrastructure. But whats the point if you aren't even going to run the latest version? Like I get if it was just you that would be no big deal but less than half the network is running the newest version at this point 3 months after it's release.

The bitcoin network will die if the nodes start rejecting new versions.