I am leery about deep ponds in turnout pastures. Summer, hey great. Winter, not so much. Where I am from, winters can be severe, snow and ice. A neighbor has a deep pond and horses, one winter a horse walked out onto the frozen pond and went through the ice. Luckily the owner is a member of the volunteer firefighters, and got the word out right away, horse was rescued. Yikes.
I do not recognize the city, so I don't know if winters are cold there.
If not, Then I would say the place looks beautiful. Yes, ideally there should be a run in shelter.