The Fighter distinction (leaving aside Eldritch Knight, which I have no problem with) between Champion & Battle Master is a purely mechanical one.
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If the Champion text felt anemic and directionless to you, compared to the Thief, that's because it is!
So I guess the question that leaves me with: Is there something UNIQUE about Fighters that mandates their sub-class design to being strictly mechanical?
Sounds like some folks are arguing "Yes, because there are so many possible types of fighters, we can't have thematic sub-classes for them all! But we can have thematic sub-classes for all wizards types, no problem."
To which I say: Who-the-what??