Well, one problem with HSS used to be that it reduced the effective power/range of the flash gun.

The strobe has spread the energy stored in its capacitors across a series of small flashes instead of one large one.

Has that been solved now for small strobes (flash guns)?

By using a leaf shutter and a real high sync speed an X100 can use a tiny on-axis fill to do the work of a larger pulsing HSS system.