@aerique @b0rk A tool that consumes roff will (I believe) never be good. (We could change roff but no.) We want a tool that reads something better and can fall back to roff. We can't convert roff-to-gooddoc.
Texinfo was meant to be that, but (I would say) failed. A subset of HTML could replace it. (And Texinfo can compile to HTML.) You'd then want a tool that know how to find the html for a given command/name.
It's "easy" except for the xkcd 927 problem. Sorry, this is not constructive.