I use it for a TiVo and TiVo mini where I have coax handy but not ethernet. That’s why I wasn’t sure if the boxes needed it or not, like a DVR type box from them. With the TiVo, all I have is one cablecard and no boxes at all.
I could have done the MOCA independent from the router, but by the time I put all the parts together, it wasn’t any cheaper or easier to manage then their router.