Getting enough War Horses is the single greatest impediment to training a high-tier army. While I get (and even agree with) wanting players to use combined armies rather than just 100% cavalry ones, making War Horses the limiting factor seems, well, lazy. If it were solely a cost consideration, okay - fair enough - but most settlements will have 0-2 War Horses for sale at any given time, at least in my save. Note: I didn't get any of the hundred-stacks of looted horses before it was patched. Maybe that changes things?