So who cares though? Hitler liked music and dogs. If you met him briefly, which is really all we get to do with the Baron, you would know nothing of that. We do not see Baron Harkonnen in his regular life, only the moments where he is scheming. I don't care to see him floating along on a suspensor belt walking his dogs, or enjoying a good book by the fire. That does not interest me. Also, again, though he gets more screen time than any other villain he is not truly the main villain. He is a tool of greater forces.
There has been a trend for the last decade or more to show all facets of the villain, to fully flesh them out beyond showing their primary motivation. Baron Harkonnen's primary ambition was to see House Atriedes destroyed and to live long enough to do so, so there is a side plot detailing his struggles with his heir. But aside from that, aside from the crucial movtivations of his character, i don't really give much of a shit.