Yeah, except that the champion has remarkable athlete, which pretty much renders your entire argument wrong, since many of the things they can do outside of hitting, they do better than everyone else. I.e., it isn't the same thing for any character.
Uh, no? Name one combat action, other than grappling or escaping from a grapple, that you can do better in combat as a Champion as a result of Remarkable Athlete--and even then, somebody with Str (or Dex) and Athletcs (or Acrobatics) is strictly superior. Which is literally anyone, because two skills can be whatever you want them to be (come up with your own background if one of the provided ones doesn't do it). For the vast majority of players, since high-teens levels are almost as rare as hens' teeth, it's a +1 or +2 bonus to a small handful of things,
most of which a Fighter is going to want to be good at anyway. If you have sky-high Dex or Str, you have little reason
not to pick up one of Athletics or Acrobatics, which is both ~twice as good and non-stacking! If it stacked with proficiency, you'd have me--it would be a benefit basically nobody (not even Bards) could get, that makes them genuinely remarkable athletically.
And that's not even considering all the other things that would put a fighter in a better position at certain tasks than other PCs. Nice try though. Doubt it will stop you from complaining about the subclass though.
Like what? Name a few. Preferably, at least one that isn't solely derived from "[I can] do X because it makes a cool story." Any character can be used to tell a cool story. That you can tell a cool story
independently of whatever a character's class is, regardless of any features it might have or lack, says that the coolosity of the story you tell with the character is orthogonal to whether the class equips you or fails to equip you with meaningful tools. Anybody can have fun playing with a cardboard box, and anybody can have fun playing with the computer that came in it, but that doesn't mean the cardboard box and the computer are precisely identical in the tools they provide you with.
Both act as canvasses for projecting something interesting and entertaining, but the computer can do so many other things besides.
Edit:
EDIT: action economy and DPS be damned! Why can't we enjoy the class for its "play potential"?
I don't really care all that much about action economy
or DPS*. I care about having tools to effect change within the world.
Every class has play potential. It's inherent to the concept of roleplaying a character--a character that
had no class at all would still have play potential. But a character that is equipped with tools to meaningfully impact the world--which, in 5e, is largely though not completely confined to non-combat spells and classes that have casting as their primary feature--has far more than
just "play potential."
*Technically, the term usually used is DPR, rather than DPS, because combat proceeds in "rounds" that can take many minutes to resolve in real-time, even though within the game world there is a seconds-based definition of the round (6 seconds, IIRC).