Each man to his own, I guess
I preface this reply, by stating clearly that I am not a Strategist
I have never seen anything approaching the Ostwind for USF, apart from the AA-Halftrack.
I honestly find it difficult to compare the Scott to the old ISU. IMO, the Scott is a highly effective unit, used correctly, too often ignored by USF players (at a lower level).
I don't mean that every faction should have an Ostwind. I just wish more tanks did damage in the same manner as the Ostwind - consistently high, but never 1 shotting squads. Right now KT, Tiger, Brummbar, Sherman, M8, Is-2, etc do damage that is too unpredictable. Sometimes the M8 is going to 1 shot your vet 3 squad, sometimes it is going to miss entirely. I think it'd be better for both parties if these types of tanks would consistently kill models, thus inflicting bleed, without randomly 1 shotting squads.
Part of this is the new cover behavior (please give us a "loose formation" button... AoE 2 had this like 16 years ago, shouldn't be difficult to program) but part of it is the way AoE profiles currently work - they need a major overhaul.