You can build anything now, but not everything is worth building; what matters is whether ideas take a shape somebody else would want to use.

design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.

product management What a product manager is for, who decides what gets built, and what happens to that job once delivery is cheap.

ideas vs execution Whether the idea or the execution behind it is what actually decides an outcome, and who deserves the credit.