Those with longer tenure though tend to end up in the powerful senate positions like becoming a majority/minority leader. Thus you end up with absolute fossils like Pelosi or McConnell who most recently basically snuck in banning hemp into the budget bill, which was something absolutely almost no one in the USA was calling for and incredibly unpopular.

I doubt a minority/majority leader with only 2 terms would be as good at snaking in this kind of stuff in, or snaking their way through the politics of various committees to kill off proposed legislation before it's voted upon, that takes practice to really get good at all the underhanded techniques.