Can I add my two cents when we’re 130+ responses in? 
I agree with a poster up thread who said there are more important hills to die on. I think anyone who insists on an ALL OR NOTHING approach to horse care (IE: “ALL horses love turnout”, “NO horse should be kept without turnout”) are probably not living in the real world.
I don’t know Dani, and I don’t follow her - aside from seeing the occasional photo of her with the feathers in her hair. I haven’t heard of any major scandals and her horses look to be happy and healthy.
I personally think horses need some time to themselves - I ask mine to behave when they have any kind of lead on, we don’t act a fool in hand, or on the lunge line, or obviously under saddle. BUT when the lead comes off - they’re free to do whatever they want. Most of the time, they have a few moments of “jump up and strike into the air” or “throw themselves on the ground to roll and then jump up and take off bucking and farting”. My personal opinion is that a horse is absolutely fine to be kept to no turnout - it’s easy with a full program to keep them out of the stall and worked and getting in enough exercise, but I don’t know how you can let a horse do their loveable, stupid horse antics in a eurociser or hand walking.
I do find it cruel if the horses cannot be with one another. I don’t know her stall situation, but I know I’ve had a mare laid up since mid February with a catastrophic, near fatal injury. She’s being kept in one of my full bar stalls, so her buddy doesn’t mess with her healing wound - but the night she came home from the hospital she let him lick her face through the bars for nearly an hour. Several of my other horses are in my shedrow type stalls that have half walls, and I’ll check the cameras at night and see them giving each other scratches or playing bite face – they’ve got the protection from kicks and privacy to lay down of the half wall, but they have the freedom to be social with each other.