Can you make a system that feels good to use to someone who didn't build it?

It's much easier to make it feel good to you if you built it.

You know all of its internals and warts, don't have to fear the thing you don't understand inside.

You can't be a fair judge of the beauty of your own baby.

"This one is special because it's mine."

The only test that it's good is that others choose to use it of their own volition.