You are reading far too much into my blog linking to rms's note. It was not a reply to you. I don't engage in that kind of indirection.
Let me put it this way: if you or anyone can send a patch to the tex4ht sources to support luatex better, while not increasing the overall maintenance burden, that would be welcome. karl P.S. CVR has actually done a lot more than me in terms of work on tex4ht since Eitan's death. I hope that one day we will actually be able to make another release, but the complications are well-nigh unbelievable.
