Now try in a straight leg brace so you can't put foot out of the way. So much harder with leg having to stick out forward and no touch toe or heel for even balance or rest
And where did you get this idea of non ambulatory? Anyone who has enough functional strength that can relieve the weight off on the affected LE (TTWB, FFWB or NWB) using an appropriate AD can ambulate as long as it's done w/ proper body/gait mechanics. I hope you're not providing any form of treatment to anyone considering this is your conclusion.