Either USF Faction is weak and can only win using airborne which mean that the commander is over performing resulting in high win rates while masking the balance issues.
or
USF is ok as faction and Airborne is OP.
In both cases having limited meta is bad for the game.
There are no high winrates for USF. They are pretty much 50%, slightly better in 1v1 and slightly worse in 4v4.
We get ~50% WR while seeing heavily scewed commander selection, either for airborne only or a triad of commanders, depending on the mode. I've made those points in the previous post, so I won't repeat them again.
It is no proof, but indication that the core faction is not sufficient for competitive play.
Therefore, saying that USF generally does not struggle might be dismissive of what actually happens, because the win rates on which the argument is based are biased.
This has been a long standing issue for both USF and UKF. Lacking core units at the right timing always makes you rely on doctrines to fill gaps. OKW had similar issues, but they have been relieved for example back when they got the MG stock and more recently with easier access to medics. USF still has some core issues that are not as easy to forgo, that's why we're seeing the current commander selection.
(edited typo)