It's probably because he's boring that he got the nod. I bet boring ones get picked because they don't threaten any of the actually charismatic politicians who have ambitions for higher office.

And also because doing the job takes so much effort (like herding cats on steroids, presumably) that politicians who want to go places don't want to do it in the first place, which again favors boring, silent workhorse types.

I mean, how many party leaders from either the House or the Senate have actually been charismatic, compelling figures? Schumer, Jeffries, McCarthy, Boehner, Pelosi, some whose names I can't even remember? None of them exactly oozed charisma.