It must be involved with anything involving money. Money is a good incentive to get work done on Plone. The Board can do a lot more with how it receives funds. It can also set expectations in written agreements or contracts for any paid work. We have PLIPs from which the Board can select what gets worked on.
I think that paying someone to manage a PLIP or push it forward from its stuck state is not a bad thing. If a volunteer who was working on it gets grumpy from not getting paid, then why didn't they apply for a grant, seek funding, or propose a funding solution to the Board?
Side note, if you have not seen this PLIP, you really should read it before you go full speed ahead with a user manual: Create User Manual with screenshots and videos for Plone 6 · Issue #3987 · plone/Products.CMFPlone · GitHub