My. Your. Our. The.
We are now beyond the user. Everything fits into multiple lives. The experience of a one-person or shared device differs from those designed for public or community consumption. Don't unnecessarily carry over the experience decisions from single-user world.
Design for scale
Scale for users and things. Design for the scale of users, their data and their devices. Each element introduces network effects which put pressure on the others. Do not let the users pick up the slack for your lack of thinking at scale.
The experience should appear to be obvious and inevitable. Go beyond conventions of the underlying technology to make the experience feel like the only way it could have been.
The feeling of ownership brings trust and the thing becomes part of life. Give reason for this with reliability, clear privacy and control.
Long term ownership of a product differs from transient ownership. Design experience for the right type of ownership.
Build it to last
Renewal rates differ. Some things will be experienced many years after the protocol or platform has expired. Battery life sees devices continue running for years. Good experience looks beyond today's platforms. How will it adapt to new protocols and platforms?