A destrier alone is 2,150 silver. That's as much as 60+ armor loomed plate. I thought most of the complaints about prices in the last strategus were about upper tier equipment like plate, steel picks, flamberges, armored horses, etc, in every battle. In my opinion a destrier is like the standard horse to a cRPG cavalry player, neither heavy or light, and affordable in NA_1.
My opinion on horse pricing is that destriers should be a bit cheaper than they are, but the heavy horses can still be as expensive as fuck like they are now. You're nerfing cavalry in strategus hard, and I feel like it's going to be several months before I can even think of playing my class in battles. I feel like horses didn't rise in price on a scale that discourages heavy gear but allows normal/slightly light gear, instead all horses just rose super high because of the formula that was used to raise prices this strat.