We know from experience that a nebulous interface that can change without notice and provides no clear contract is a asking for trouble and will break your house "build", so to speak, or worse, it will bork at the worst possible moment, when you have "clients" over.
In the early years of home electricity, there was a much higher chance of getting electrocuted or burning to a crisp, outlets had no grounding, insulation and conductors were of a bad quality etc. Similarly, the whole field of home automation is in its infancy, in a few decades most major mistakes will be made and early adopters will work out the kinks out of the technology (and find out why it's a bad idea to have an internet connected microphone listening in your home at all times).