One of the biggest barriers, I think, is time. Asking pwME to contribute meaningfully to discussion and decision making in rapid real time meetings will preclude many.
Group emailing is inefficient. I think something like a forum where people can contribute to an ongoing discussion as and when able is more realistic for many. So a meeting that needs to come to a conclusion in 4 weeks could be held as a 4 week period of forum type discussion facilitated by the lead researcher with all materials and a clear list of decisions to be made, being made available at the start of the 4 weeks. Also there could be ongoing threads where all the research team including the patient members share informal discussion of issues as they arise.
There is also the problem that many pwME who only have experience of mild to moderate illness may not fully appreciate aspects of more severe ME/CFS, and many may not understand the flaws in research such as we discuss on S4ME.
When my ME was mild and I hadn't any real contact with other pwME, and had little experience of ME/CFS research discussions, I would have been only of limited value as a patient representative on a research project. I think some sort of training for PPI participation could be useful.
I volunteered once for what I thought was intended to be meaningful PPI, but was rejected on the grounds that they weren't interested in people with experience of the sort I have from S4ME, they just wanted people to try out draft versions of their questionnaire, and would choose their people randomly from anyone who applied.
And not that random/new. What I'm slightly hoping is that there
might be some things from eg the market research society where formats like this have been tried - and if not why not get in touch with them? It sounds so pertinent for ME research, plus an interesting development for them (including to maybe help with some guidelines in general for when pwme are involved in other things/the more general)
Years ago I was trialling out 'online' focus groups that were by writing on a thread ie not 'video'. They were a different beast to in-person but was shocked at the different pace of them in the number of questions you cover because of the nature of you ask a question and everyone replies simultaneously then can read each others' input, without it being a round-robin. The fun bit is then how you write up so much (compared to what you'd get from a slower in-person group) but at least you've the transcript to begin with.
Given with ME what level I'm able to think at when having to multi-task because everything is simultaneous ie if I'm having to reply to a question in person in a certain timeframe, having processed that (and might be sitting up and other things) there is the auto-response to just say something.
So there is definitely something to do with not being something based on someone else's timeframes. Because even if we squish a gap in our lives to do something, we actually need that to be when we are properly up to the task and we don't have the control of our lives or bodies to guarantee that for someone else's timetable.
A forum type format is good because it is the one thing that allows for that time-zone difference as people can come in and read the full relevant trail, post replies to what is relevant etc.
I think some of this is ME-specific but a lot of it is the topic-matter and how personal it is, how much we've been gaslighted (and carry the burden for other people's issues, feelings and sensitivities), how complex the illness is adds to how you might think on the same question in a different way another day and come up with different answers.
Or small changes in wording make huge differences to the reply - such as the 'can't' and 'can' coming with endless caveats. So it would need someone absolutely double-checking their interpretation is what was actually intended.
The risk again is cherry-picking and people being aware of needing to weight and understand different severities and situations so they don't just go with 'majority said' type standard questions and interpretation when if eg something is about accessibility they need to get that if they want to say they cover severe they need to be listening to that ability-level (or those who have been there).