There hasn’t been any official explanation of the 200 device per location limit. There’s lots of community discussion in the following thread (The topic title is a clickable link):
It may be helpful to know that in the past smartthings employees have said publicly that most of their customers have 15 or fewer devices and never use any custom code. The members of this community are a very small minority of the total group.
My own guess would be that with the move to more code running on the hub itself they think the hub will run out of memory if they allow too many devices. But that’s just a guess.
If you believe you are going to need 400 devices, then smartthings may not be the right platform for you. I think it’s going to continue to be aimed primarily at purchasers of the Samsung smart appliances and smart televisions who just want to add a few additional items and don’t even have a hub. That’s probably over 90% of their customer base now. But again, that’s all just a guess. Read the other thread for a more detailed discussion.
