> I don't see why I should need an internet connection to turn on a light!

I hope manufacturers see it the same way.

I don't mind devices having to be certified, I mostly want to buy hardware of the shelve anyways for safety and convenience reasons and build the controlling/automation part myself. So my biggest worries are not having a local API, data exposure and having to invest in a ecosystem and having the manufacturer brick it remotely, wasting my money.