This limit is coming to the US.
Do you get a second checked bag?
Do you swap the steel backplate for Aluminum?
Some airlines have free bags for certain people? Or 70lbs instead of 50lbs?
Putting regulators in a hard case inside the checked bag worked, but the weight of 5 regulators was terrible when the airlines moved from 2 bags as the norm to one and now we pay per bag.
Considering the cost of Helium for open water dives (and CCR in general), the additional bag cost barely moves the needle for a week of tech diving. When the gas bills alone are $1500 for the week, a $100 bag fee is an incidental cost. It just feels morally wrong to pay the airlines anything when the treatment is so bad. It feels like an obligation to screw them as much as possible.