I've not seen the CTC article, sounds interesting.
I started riding with the CTC about 27 years ago, my first 200km Audax was 25 years ago, and I've been fitted for a few new bikes over that time. So I've had lots of advice over the years and I thought my setup was about right. However no one had noticed my legs were different lengths. As soon as I tried the sizer cycle with the right crank 5mm shorter it felt better. The cost of replacing both right hand cranks we bought with our last tandem will exceed the cost of the bike fit service, so in our case it would have saved us money to have had it done sooner.
One of the things I liked about the bike fit we had was the sizer cycle allowed the reach to be adjusted as we rode. So the reach was increased and decreased repeatedly until the most comfortable position was found - I think that this is a much better technique than trying different length stems on different rides. In my case I've rarely changed the stem from the one I bought with the bike (i.e. I've stayed with the stem length that I chose when buying each bike).
C. is fairly tolerant of a variety of riding positions and favours what she is used to on each bike. The sizer cycle allowed her to experience the effect of adjustments and the advice she was given was very helpful.
It remains to be seen if there will be any tangible benefit to our modified riding positions. I hope that it will make longer rides a bit more comfortable, efficient, and help avoid injury as our mileage increases.