Just try it....Im still a bit lost with this, i assume for washing machines, dishwashers, stuff like that, it needs to be a "smart" appliance? And you can't just do it with a bog standard Beko?
I still don't really know what i'd use it for over unified lighting, blinds and heating control...
To your point, some people get a cheap smart energy plug and plug their washing machine into this to track energy usage and so on. In terms of other things, it really depends - I've got views of local motorway webcams along my commute, so I can check traffic, Local weather with realtime satellite maps, computer monitors to check temps, network activity, constant broadband speed test (and ping) and loads more - so you don't just need smart devices....!