I've seen quite a number of people helped by the method. The study (one study) doesn't say that the method doesn't work, only that the trials were small, which is the bane of those without deep pockets.. That's a game for huge pharmaceuticals. Even the effect of diet on heart disease was not subjected to RCTs until recently. We don't demand large RCTs for techniques of teaching navigation (though those skills affect orienteering performance substantially); we'd be happy to have any evidence. Twenty years ago, pilates would not have had many RCTs, despite being a century old.
Others have had very positive experiences with Feldenkrais:
The Feldenkrais Method® is based on anatomy and developmental learning, by a published judo master whose wife was a developmental psychologist.
My aunt was an Occupational Therapist for decades (teaching motorcycle accident victims how to feed themselves again, from what I gathered). She retired, then discovered the Feldenkrais Method, and was impressed. She felt it contained an excellent way to teach everything that she'd been trying to teach people in her career as an OT. She's since been a practitioner for decades. I've met a number of PTs and a massage therapist who use Feldenkrais in their work, because it works, and provides tools not present in their discipline.