I agree with you
@Invisible Woman.
Thinking about my wife, she has improved to some degree over the years, albeit long way from recovered. But that has come about that by taking the opposite strategy to what is suggested there, coming at it from the other direction.
She does not make conscious efforts to
increase her activity incrementally; 'increasing' is not the guiding metric. She instead always strives within what she is capable of, wherever that limit may be at the time, and over the years I think that limit has increased a bit for her.
It's
not about "progressing with very gradual increases in physical and cognitive activity", it's about living within and towards your limits as best as possible, and letting that limit guide you. It may increase for you, it may reduce for you, indeed it may well fluctuate for you. If you are lucky, then there will be an upward trend over time, but if so then the trend is a happy side effect of the strategy you are pursuing, not actively being driven by it.
If you seek to follow a programme of increasing exercise, that will likely fool you into not properly recognising the limits, and so push through those fragile limits and blow it all apart again.
To the naive it can sound like what I'm saying is the same as what the bold text above is saying, and some may well assert it is. But no, it is not. The bold text is predominantly open loop, with a bit of lip service to closed loop. Predominantly increase, increase, increase activity, with lip service qualifier saying to stay with the envelope limits - but the focus on increasing activity can undermine the necessary focus on limits and to be guided by them.
Closed loop is to recognise the limits and to use
them as the guiding yardstick for what activity to do or to not do. To not even think about increasing activity, but just do whatever you can sensibly do in the moment. If those limits extend, then so will your activity as a natural follow on. It's all about the metric you focus on - should not be focusing on increasing activity, but focusing on working within your limit.
As I write this I can see how this runs so very counter to mainstream rehabilitation and will be alien to many who are familiar with and see it as a guiding light. But the whole point is that ME/CFS is far from mainstream.