Obviously horses are good, but you act as if using horse emblem is the only way to succeed in FEH, when clearly it is not.

It's clearly the easiest, least resource intensive, and most broken though. Why use anything besides horses when they can do literally everything for... maybe 80k feathers, total, while other teams/units may require that on their own let alone for a full team? Horses can take you to T20 arena, clear GHBs, clear Tempest, clear any other PvE content they add (Infernal Lloyd is a perfect example) with ease. Why spend time on anything else if you actually want to clear content?

Not to mention Panic Ploy is going to be a skill on the next GHB unit, so if you hate horses that much you can put it on two of your units at least, no problem.

Panic Ploy doesn't counter 3 tile movement, DC weapons, or the extremely poor arena design that allows horses to be on defense teams for T20 arena in the first place. It doesn't prevent IS from boosting enemy AI unit stats by 3-4x to allow them to just ignore Panic Ploy. It doesn't even counter 4/4 horse units at a time unless somehow I have it on all members of my team, which means I don't have buffs and makes the "countering" aspect almost worthless to begin with.

Oh, and it's limited. I can only ever put it on 3 units until he gets his rerun, then 4, then however many months until another. Meanwhile in that time, Cavalry units will remain at the exact same or higher power level (because they haven't nerfed them yet, I don't see them doing it) and just be improved via their costless SI/merges - OH, and higher merge Reinhardts/Cecilia will be even more common as a result of the 3/ 4 rate swap.