Adding Product To Your Startup Team
There are a variety of reasons this should come to an end....
Some people say you should wait until you reach Product-Market Fit.
If you get immediate traction from your MVP, maybe that will work.
- Though in some cases that early traction is scattered across market segments, in a way that doesn't scale.
But if you need serious Customer Discovery, a co-founder probably won't have the time/focus to do that, and is probably a little over-committed to the initial vision/plan.
Likewise, this is not the time to hire a "junior" (3-5yrs experience) Product Manager: such a person hasn't seen a broad enough variety of challenges to have the "product taste" necessary to find the path to success. (A-Player)
What should that Product person do when they arrive? Product Management from MVP to Product-Market Fit