The usage page is invaluable for understanding your spend rate, how that relates to work, and especially how it relates to the value of the work you were able to complete for that spend.
I think that the current implementation is .. clunky. I don’t know what the cutoff is for a batch of charges to get put together, but it doesn’t seem to be by turn. I think it would be drastically more useful to have the default view group spend by conversation, then perhaps it could be broken down more granularly somehow.
Feedback is how people learn, and right now the feedback manifold lacks actionable information most of the time other than “wow that model was expensive compared to this one”