I would have thought excessive grooming would add to shedding, as the coat tries to regulate itself???? I have no scientific data to back this up, but it's just a hunch.
Twice a week... God my dogs would disown me. Mine are lucky to be bathed once a month, and that's a huuuuuuge jump for Bodhi miss never bathed. She only gets baths if she smells actually... Fred is a boy and does smell more!! We bathed him once then went to the vets about 2 weeks later and the vet thought he'd just been done and complimented him on smelling nice!!!!
I can't see it doing huge amount of HARM but I doubt it does any good, any more than over doing it with our own hair.
I'm not a groomer, of course lol. I actually have no idea.
As for hair here.... We don't suffer too much!! Short stick hairs. No floof. Don't. Like. Hair. I remember when we had our collie, you could literally peel the hair off the floor.... Even though we hoovered very regularly. I think they just shed. Honestly. It's a dog.... It's what they do
Ours don't go upstairs much, baby gate. Clothes are all upstairs!!! They prefer to wipe their snot on me than shed on me :yikes: