I just had a barn built last year and the divider walls are 8’ of bars towards the rear and 4’ solid wall in the front. Each horse has privacy while eating but can easily see each other. (BTW, it has a solid bottom wall. The bars are about chest height.)
The air flow is so nice. None of the stalls feel muggy or hot. On Saturday we had an extremely hot day (101 degrees), I was so happy and I’m sure the horses were too!
When the barn was finished and we moved the horses into it I weaned my filly. Since she was able to see her mom, she didn’t even let out one whinny (and neither did mom). Best “stress free” weaning that I have ever done.
I might not like this in a big boarding facility if I didn’t have control over the neighbors, but for private I think it is the best:yes: