Hold on, no one here is looking for “fine grained” funding mechanisms, in the sense of, as you put it:
A fine-grained allocation of funds can be expressed as: “ We will build x function for $y in z weeks
Again, let’s take the aforementioned Scalability discussion by @nathan-at-least and @daira as the example. It made a case that Scalability is important and plausible. That’s very mucn on the “coarse grain” end of the spectrum, but it conveys deep thinking on the subject, and is appropriate for the phase we’re in.
In my opinion, ECC should convey at least that much information to the community, about each of the main directions it intends to pursue using a Dev Fun.
In the case of complex goals like “UX improvements to help drive z2z adoption”, I would also expect this to be unpacked into the many technical + nontechnical components this entails.