From the first moment I rode a horse in BoTW it was obvious that the horse riding was superior to anything else I've played.

That said, Red Dead 2 will probably at least match BoTW but Nintendo always have an intuition in details like this that no other company can compete with

No, procedural patterns and such.
Each horse will be unique, kinda like Spinda.
Tweaked animations and suck to better represent the temperament, and such of the horse.

Polish.

Conceivably.

I was always convinced of Nintendo's ability to make excellent horses.

When Twilight Princess was still the newest Zelda, I used to laugh at how my mother struggled controlling the stiff and unrealistic horses in Oblivion. Those were terrible compared to Epona. BotW's horses are TP's already flawless Epona perfected.