> I suppose there is an argument that if you are building the wrong thing, build it fast so that you can find out more quickly that you built the wrong thing,

A lot of people are so enamored by speed, they are not even taking the time to carefully consider the full picture of what they are building. Take the HN frontpage story on OpenCode: IIRC, a maintainer admitted they keep adding many shallow features that are brittle.

Speed cannot replace product vision and discipline.