Once you’ve got houses nd donkeys, why bother with zebras? Once you can have sirloin and rack of lamb, why bother with wildebeest? The success of domestication creates its own limits. It works so well, we don’t need additional grain, fruits, vegetables or meats.
Houses s/b horses
Yup, once a role is filled adequately why bother taking the time to develop a completely redundant capability from scratch with a different species? Especially when that other species may lack the capabilities of the one it is redundant to.
Raccoons seek out human settlements for food as well. But theycare decidely lacking in many areas to both dogs and cats, which are very much multi-mission tools.
Different species available in different places are one constraint; availability of that species through trade and migration is another constraint. Whatever was the least trouble, or, whomever was best *at* doing it, was yet another constraint.
Hard to disagree with that. I'd much rather live in a house than a zebra :).