But it's still a balance between reality and the interesting subset of it; having to manually brush your horse with a mouse would be awful, while requiring that you take your horse to a stable every night would be fine.
The main issue is that to design a decent simulator like that though, you have to avoid basically 90% of modern gaming trends. Fast travel, mechanically-intense play, grinding missions, small-but-numerous subquests, etc are exactly what a modern (A)RPG pushes for, and are exactly how you ruin a game like euro truck simulator. It's the mundanity, scheduling and (some) repetition that makes the game satisfying.