Edit - no idea why Octal omitted the URL:
https://www.core77.com/posts/145699/Toyota-Releases-Video-of-Wheelchair-Alternative-Mobility-Concepts-in-Action#
Then there are all the concerns about how to properly suspend the user in the exoskeleton, and what happens when they fall over?
Yes, that is an additional tool that should one day be in the toolbox, for the people who can safely use it.
But for today, better wheelchairs are a better answer than waiting however many decades it may take for suitable powered exoskeletons to be invented for them that can be properly controlled and are safe to use for people who would otherwise need wheelchairs.
And at that point, why not just grow their own legs back, so that they don’t need the exoskeleton at all?