Anyone can make any of these clothes, and even if simpler pieces are his thing, he needs to find better fabrics or at least better pattern cutters and sewers.
For a lot of the newer designers, jersey has become a go to but they all work with it the same way and style it the same way. A simple sleeveless sheath can paired with an nicely cut jacket, or jersey dresses can be cut and warped to have Vionnet-esque drape to them. It isn't that hard to construct a high-necked cowl effect or contorted draperies, but mediocrity reigns supreme these days.