Should next gen systems be fully Backwards Compatible from Day 1 to encourage people to upgrade?

[VAMatt]

They will both be 99% or more backwards compatible. I'll note that XB1S does not have a Kinect port. MS will give you an adapter to use your Kinect with it though. The same could be done on neXtBox. I'm sure something similar could be done on PS5, if necessary (though I don't see what would require this on PS).