The Next Feature Fallacy: the fallacy that the next feature you add will suddenly make people want to use the entire product.
A big difference between a junior and senior designer is the ability to make judgments outside of personal preference.
Work with people who give you energy, not with those who take it.
"Quality is the best business plan." - John Lasseter, Pixar
Designers not doing usability tests is like scientists not doing experiments and hoping v1 works flawlessly. Kind of insane.