The amount of data a table often contain presents an accessibility issue in itself. Simple tables with few datapoints is not a big issue though.

I haven't found a good way to highlight the data points in a table in such a way that it is easy to pick up by a screen reader. I would love a summary tag or similar to be part of the table in the same way we now have caption.

Anyway, I find the solution with tables way better than other html based chart solutions I've seen in regards to accessibility. They usually have a bunch of divs, spans and other tags that are really hard to follow.

Using tables seems so obvious now that I see it. I'm surprised I haven't seen it before. Good job!