Perhaps a matter of perspective can help.
For me, I distinguish between core needs (hoisting, for instance) and nice-to-haves (in this case, embedded mindmapping). Obviously, each of us would have variations in what we would consider core versus nice, though there is surely a lot of overlap.
I think the priorities in Kinook's road map are pretty good.
And - given that everyone, even a genie like Kinook

, has constraints, it's hard for me to get even mildly annoyed about nice-to-haves.
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Also - it sounds to me like you're interested in using mindmaps as a navigation tool for URP. I hadn't really thought in those terms, though I can see the sense of it.
I was simply thinking in terms of being able to have my mindmaps easily accessed in my project folders, instead of having to leave URP to get at them.