Thanks! About the quil utils - you mean get rid of them, or you think that they would be useful on their own? Btw, I only use quil for the sketch setup, the plots are done in low-level Processing. Quil does some(un)boxing, so It would be a drag when plotting millions of sample points.
Ultimately I've been disappointed with Incanter, which seems effectively abandoned at this point, and I'm always on the lookout for alternatives that might one day rival the tools available in R. I use quil for various visualisations, but it (and I guess Processing beneath it) is jarringly mutable. Despite that, it would be interesting to me to see more plotting libraries spring up for Clojure, I suppose that was my point.
Bayadera does not aim to rival or to mimic R tools - it aims to be better! But, it is strongly opinionated; either you take the bayesian path, or you use something else :)
Currently, I do not have resources to take on the task of creating a general-purpose plotting library. My idea with the plotting toolbox available in Bayadera is to provide a tool that would do one job - provide fast, easy to use, plotting for exactly those types of plots that are needed for bayesian stuff - and do that job well.
Plotting in general is not that hard technically, but the problem is that each user in each situation wants something unique. The level of customizability found in ggplot, matplotlib and the likes is rather high; that's something I do not have motivation to pursue.