Sounds like adding a whole bunch of steel in front of a stud wall makes sense but why would anyone go to the trouble for a $600 tub and wall kit... Throw some insulation in the wall and call it a day
Thus the reason I would never hire someone who calls himself a "Bathroom Remodeler".
It's really no trouble at all, because it's my house and I have nothing but time.
When I'm watching TV in the adjacent room, I would rather not hear noise coming from the bathroom.
It's an afterthought that obviously has many potential solutions.
I would much rather analyze and do something decent now rather than have it bother me after the rooms are finished.