I was sceptical until I bought a set of second hand XTR brakes with goodrich hoses on them. They feel noticeably sharper than an identical set up on my other bike with standard Shimano hoses and new fluid. Both systems bled properly by me with the same new fluid.
Also recently I test rode a couple of motorbikes – both pretty similar aged SV650’s, one had goodrich hoses and the other had standard. The braided hose brakes again felt much sharper, but I don’t know how old the fluid was in either system.
Having said that, I haven’t bothered replacing any of the hoses on my other bikes, if you want better braking a bigger rotor is cheaper and less hassle.