The truth of the matter is I can find no real point to sim except for the enjoyment I get from it. Sim can or cannot be based on reality. My game is on the verge of both, and how you play is up to you. That's what's so great about Dreamscape. I don't say horses can't talk because for all we know they may.
Humans can only guess at what the mind of equus thinks of.
It is not the man that tames the horse - it is the horse that allows the man upon his back. In the wild stallions form herds of mares, and DS is mostly based on this. Rose giving may not be a part of the wild, but I will play as I chose, and you may do the same. Some sim games I have seen also do not allow stallions to share territories. In the colder months, rarely, stallions will cimbine their harems, though one is usually dominant over the other.