I think you cannot get a grip on the P2P without considering what it is. Its NOT about science or medicine, the process used is definitely not scientific. Its managerial. Its about how bureaucracy can manage. So its a bureaucratic process, stupidly ported from areas where it is more applicable to ME and CFS where it is highly inapplicable.
To err is human, but to really bungle is bureaucratic.
This is part of an unfolding impact of EBM, Evidence Based Medicine, and the dominance of that being used to push through management decisions and processes in medicine. Science is secondary. This ties into economic rationalism, or efficiency in public spending. This ties into the ideology coming from the biopsychosocial proponents on the extremes of that ideology.
In my opinion, in part this is about patching problems, rather than solving them. Patch on patch on patch. Given the cost of many diseases which get little research funding, and given that ME is at the bottom of that pile or very close to it, its a flawed process that will inevitably be seen as an utter failure, and bureaucracy, government, politicians and doctors (and especially medical organizations) will have their reputations tarnished yet again. Hence the need for damage control. They are of course hoping that by the time this comes to light the current administration will be gone ... every administration hopes that, but at some point the music stops.
This is playing political party games with the health of millions.
Let me be clear though. I am not suggesting some vast conspiracy. What I am suggesting is the natural order ... systematic human stuff-up. I don't doubt there are small groups colluding to make things go specific ways, but its not a grand conspiracy in my view ... but as the outcome is roughly the same either way its largely a moot point.