[Poppys]

Playing Devil's advocate, if the themes are inaccessible, the user can always pick another one. Monochrome might provide the contrast ratio you want.

[nkrisc]

My recommendation is always accessible by default. If the default theme is not accessible, it may be difficult for the user to switch to one that is.

It's so easy to make a site that is accessible - a blank HTML document with no CSS essentially is. It takes work to make a site that isn't.

[nkrisc]

Too late to edit but I didn't mean "blank" as in no content, that would be pretty pointless. Poor choice of words.

[JohnFen]

But why would they? It's much easier just to move on to another site.

[postalrat]

Isn't that why HN sucks?