I think that a good audio video system with central switching would make most of my clients happy. Some like and can afford good lighting control. The other things (security, HVAC, pool and hot tub) are becoming too proprietary with their own apps. What's sad, is that some companies are making it difficult to do that without replacing everything, whether the equipment is worn out or not. I'm a little miffed right now that I had to replace an expensive main processor in order to control a newer AV receiver. Changing to HDMI switching I understand, but that shouldn't cost so crazy much. We are definitely simplifying the systems we install and are recommending local zones more often.