Strong agree here. I'm a non-technical founder.

I tend to interview 30-50 people initially to find a gap in the market. If I'm into something (strong PMF), a good percentage of those people I interviewed will be future buyers.

I typically have cascading meetings for the following steps:

1 - is this 10X better than what currently exists

2 - does our prototype look 10X better

3 - does our v1 solve the gap we found

4 - what features do we need to build in order to get you to pay for it

5 - what features do we need to get you to refer us to 3 friends

A meeting for each of those goals typically leads to customers (again, if I've found PMF).