"capable of work in the not too distant future"
Absolutely. But this does not form part of the assessment. You are assigned to a group according to points scored on your current capacity. So if you score more than 15 points but less than the Support Group threshold you go in the WRAG even if they expect you never to be able to work.
It is, as you say, a complete waste of resources.
Here's another waste of resources.
I'm provisionally in the WRAG in order that I get ESA while awaiting testing. But instead of getting on and testing me, they are trying to make me jump through the WRAG hoops. From their point of view, they don't know whether I'm properly placed in the Support Group or thrown off ESA altogether. But rather than spend 20 mins testing me, they are spending that same amount of time on "work-focussed interviews" and threats to send me on basic literacy courses.
It all makes work (at taxpayer expense) for the industry of dodgy "literacy and CV-writing courses" which has sprung up to be parasitic on both the taxpayer and the disabled, while offering value to neither.
(Oh and by the way, voluntary preparation for work services have been available for disabled people for years under Pathways to Work. Apparently they had quite a good success rate, because participants were self-selecting. Whereas basic literacy, CV-writing lessons from a 20-yr-old, and "moral support" were never going to be the slightest use to me.)