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

If you think of the product as a service, then the separate parts make no sense - the point of a product is to offer great experiences to its owner, which means that it offers a service. And that experience, that service, comprises the totality of its parts: The whole is indeed made up of all of the parts. The real value of a product consists of far more than the product's components.

We expert teachers know that motivation and emotional impact are what matter.

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

I think there is a tendency in science to measure what is measurable and to decide that what you cannot measure must be uninteresting.

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

It is not enough that we build products that function, that are understandable and usable, we also need to build products that bring joy and excitement, pleasure and fun, and, yes, beauty to people's lives.