The problem is not necessarily speed. It is the speed-to-quality ratio.
If you put out a small update, (which, let's be honest, the Diane "update" was pretty dull and didn't encompass any story at all, few dragged out sex scenes and pretty short) but you require larger and larger amounts of time, that's milking patrons. Disclaimer though, this is just how I see things, it's completely subjective.
You say they get ambitious and tackle more varied and well crafted content. Where is that? When was that? They did almost no main story in almost 3 years since release, and they've started 'remaking' character stories. I mean, come on.. I sincerely want to be 110% proven wrong, with this upcoming update. But I am not very hopeful. To take 5-6 months to remake the Jenny story is pretty long.