Same way ebike cycling can be invigorating.

It lowers the barrier for entry, doesn't prevent effort

I need glasses to see and still find sight invigorating.

I love cycling. Even without electric assist I find using mechanical advantage invigorating.

No one is forcing an exoskeleton or ebike on you. Why can’t you be happy for the people whose mobility it improves? What have you lost by their gain?

Because “invigorating” is relative to one’s own capabilities.

There is also quite a lot in between “climb a mountain” and a “walk in the local park”.

One of the positive results of having the option to engage mechanical assistance is pushing myself beyond what I thought I am capable of, and surprising myself by not needing the assistance at any point. It improves the safety of pushing the envelope, for example I'm not going to risk attempting 30 miles if I think my limit is 20 miles unless I have a way to safely return if I can't do so under my own muscle-power