I guess you still need to talk to your users first, in order to understand them and build the right product.

GV does that the first day as Jake Knapp mentions it in this video: https://youtu.be/aWQUSiOZ0x8

Just because 4 weeks of pre-research is not relevant, it doesn’t mean you should do none at all and commit designers favorite sin: start designing right away, what he thinks people would love.