The feet stuff imo is, not to shame someone elses stroking but I find all of it extremely boring, thighs are peak though.
Venefica was good not because of some itty bitty cute moments but because she showcases a deeper character than simply being a powerful dommy lady. Ushris isn't in this category so she can't be compared, she's in the 'Noble lady slave owner' (pets and slaves are literally the same). Think of it, highly eelegant, obessed with tea, most magically skilled (which in fantasy fiction is often attributed to nobles) and has a minimum amount of bratty to her.
I too agree with you though that she's incredibly wasted. The extreme rejection of sex aside, her being a part of the pet kink is just very disappointing coming from a maledom enjoyer, and knowing thresh it's unlikely ushris will be changed into a switch much less a sub. So we can only lament in our own bad luck.