There is fairly little biomechanical harmony on display - even though the leaning aspect is probably fairly biomechanically-feedback regulated, humans are a mesh of muscles that can move independently very fluidly and dynamically and a super sophisticated nerve control system.

To look sleek you'd want something that had a couple dozen parameters w.r.t. muscle geometry, rather than just that basically boils down to a single 'theta' representing lean angle.

Basically it because it bottlenecks fluidity of movement so it's like a fluidity straitjacket rather than an exoskeleton. Low skill ceiling appears like a low skill skill.