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Because hydraulic rim brakes are superior to traditional brakes.
Isn't this just because of better modulation (caused by a better transmission of power i.e.no cable stretch)?
Hydraulic brakes are not inherently more powerful as they work on the same brake pads as a cable system (pad grip on rim being a limiting factor).
The other factor is the power which can be applied (by any transmission system cable/hydro/chaindrive) to the brake pads, this is limited by your hand strength.

Running a cable to a cylinder and piston at the brake has all the stretch of a pure cable system it just moves the pads around indirectly.