No one appreciated a light mech except for light mech enthusiasts. It took a special kind of mech pilot to truly enjoy the rush of speed, even if it meant sacrificing a lot of personal protection.
The reason why Ves stuck to a medium weight class for his Crystal Lord design was because he did not wish to narrow its potential audience any further. An overly narrow mech design might not face much competition in its niche, but it would also be destined to obscurity.
The main issue at play with the light skirmisher archetype was that its effectiveness drastically different on land, air and space.
Light melee mechs saw the most use in landbound mech combat. Combat took place in smaller areas and mechs on land moved slower and their weapons exhibited many restrictions in range. This allowed light mechs to approach their landbound prey with ease by taking advantage of the natural cover of the terrain.