AS for all those mistakes I make - they are on purpose - to teach you how to deal with them

So what does a good teacher do? Create tension - but just the right amount.

To me, error analysis is the sweet spot for improvement.

The designer has an obligation to provide an appropriate conceptual model for the way that the device works. It doesn't have to completely accurate but it has to be sufficiently accurate that it will help in both the learning of the operation and also dealing with novel situations.

I think a successful company is one where everybody owns the same mission. Out of necessity, we divide ourselves up into discipline groups. But the goal when you are actually doing the work is to somehow forget what discipline group you are in and come together. So in that sense, nobody should own user experience; everybody should own it.

Forget the complaints against complexity; instead, complain about confusion.

Also note that invariably when we design something that can be used by those with disabilities, we often make it better for everyone