That is just a guess, but for Ncase M1 (120 mm for CPU and 120 mm for GPU) and some back-to-back cases like A4-SFX, wouldn't it make hose routing easier/give more options for layouts as well?
Anyway I can see why for a twin fan radiator that goes always on top or upfront having this kind of 90 degree bend on tubes would be bad, but for a 120 mm fan that potentially goes at the back of the case inside a standard tower/mini tower case, there wouldn't be much problems with it unless it was hanging directly onto the back of the GPU. But once again - more options to route hoses even for mainstream cases. Maybe tucking the hoses at the back of the case and over the motherboard edge would become a thing over hanging right in the middle over the CPU area.
Anyway I can see why for a twin fan radiator that goes always on top or upfront having this kind of 90 degree bend on tubes would be bad, but for a 120 mm fan that potentially goes at the back of the case inside a standard tower/mini tower case, there wouldn't be much problems with it unless it was hanging directly onto the back of the GPU. But once again - more options to route hoses even for mainstream cases. Maybe tucking the hoses at the back of the case and over the motherboard edge would become a thing over hanging right in the middle over the CPU area.