I absolutely have data visualization in mind for this, as I think it can benefit greatly from the scale. But the pipeline I've built is very agile, it will easily handle a diverse mix of items. It's not like OpenGL etc where there's a certain amount of overhead for a draw call so there are significant gains to be had from instancing and batching.

It is likely that CPU-side encoding can be made more efficient, though, by just filling in quantities to a template, rather than encoding from scratch.