I really liked Leigh-Anne’s point on the idea of guided reflection. In my admittedly-limited research experience, it does seem that while research participants, or funders, or other non-core members of the research process may be willing to provide reflective comments, their more shallow engagement with the research process by simple virtue of not being embedded in the every-day workings of the project can lead to rather shallow reflection or evaluation. A guided process would seem to be more valuable by outlining which aspects you need to receive feedback on.
I also strongly agree with the point that post-hoc reflection for long-term projects, if occuring in isolation, seems almost wasteful, especially if the reflection or evaluation suggests substantial changes to the project itself.