Journal
Product
Talk to the people who do the work. Watch the ugly tools. Write down the constraints. Then decide.
Engineering
Core Web Vitals are not a Lighthouse score. They are whether a broker waits or opens a competitor tab.
Product
Auth, tenancy, billing, and an admin are not phase two. They are how you discover whether you have a product.
Engineering
A website is not a stack of sections. It is a contract between operations, customers, and the people who have to change it on a Tuesday.