Though it takes weeks to recover for many CFS patients, I'd still like to see this become a standardized test. That dropoff doesn't reproduce in deconditioned or elderly controls. I'd imagine it would be a relief to a lot of folks to be able to point to something for LoA/disability paperwork to say "See? Actually something physiologically wrong. Not a lack of motivation, not all in my head."
It's unfortunate that the resulting burden on the patient is so large, but I really feel this would help physicians understand this isn't just a case on ongoing fatigue. Particularly on a follow-up appointment in the weeks after testing where they can see you stumbling around like to have the flu, note the tender points and weakness, see the extra time it takes you to respond to questions, etc. One of the toughest issues I've found is that because you spend several days "gearing up" for an appointment, your PCP often ends up seeing you on one of your good days, leading them to underestimate the severity of your illness.