"It has hydro brakes, which are heavier" than what? The entire line has hydros.
Also, hydros are only heavier than mechanicals if you use reverse math. Weights for the hydraulics always are a complete front brake assembly- rotor, caliper, line, fluid, and lever whereas mechanicals only call out the weight of the caliper and rotor set.
Therefore weights would need to be normalized-
Hydro system < mechanical system including cable, housing, and brake lever
For example, Avid calls out 428g for their Juicy 5. However, the BB7 weighs in at 318 (325 for the BB5). Their lightest lever is the Speed Dial SL, at 150. We're up to 468g already, and we haven't factored in the cable or housing, both of which are heavier than their respective hydro counterparts.
Hydraulics ARE lighter than mechanicals. It's that simple.
miles