Oh, sure, and I don't expect them to (they've certainly done basically nothing for the PHB Ranger Beastmaster, despite many UAs). I don't think they'd have even touched the Bladesinger but for the desire to fix the racial restriction.
Balance is loose enough and death is hard enough that it doesn't matter that much - and people make bad tactical decisions at tables all the time (sometime because it is fun). But if the argument is the champion gains effectiveness in trade for its relative simplicity, I don't think that's true (it certainly isn't relative to other fighters, and the hexblade is competitive with them). Even the Samurai (which is rather simple) has better tools (for employing GWM and/or SS particularly).
But, I'm not terribly interested in the merits or failings of the champion because I'd never play one. but for a three level dip perhaps. It's a distraction from the larger discussion, spurred by someone else entirely implying the the champ was, somehow, uniquely suited to protect and support teammates.
Specifically, this:
I mean, you could say the same about an archetype-less fighter, or a Warrior sidekick.