You're talking about Seed and Wing with this right? I'll admit I haven't seen either one of those completely, but in Wing at least isn't Heero the only one who's capable in a hand to hand fight? I don't know much about the other protagonists but they don't seem to be that combat saavy outside their suits, though like I said I haven't really watched it.
Also, even while true that these other two series places an importance on the physical power of the protagonist, these three are vastly outnumbered by the series that do not place that sort of significance for the pilots. Especially in basically all of the UC shows.
Wufei has significant hand to hand combat skills as well and they all are trained.
However yes, as a whole out of the Main 5 Heero is the only one, but they take it so far with him they go into genetics, clones and Gene splicing so he is pretty much minor levels of super human, so calling him just capable is like giving Domon the designation of capable.
Also you'really right these three are in a minority but your original post said that it was only G which isn't true, even if G focuses on it more so I just wanted to point it out that we do have some leads who are physical crazy as well as pilot stuff.