There’s a version of product thinking that lives in frameworks and planning docs. And then there’s the version that shows up when someone looks at a screen and immediately knows something is off. That second version—call it product sense, call it taste or judgement—comes from doing the work, not reading about it.

Peter Yang, writing in his Behind the Craft newsletter, shares 25 product beliefs from a decade at Roblox, Reddit, Amazon, and Meta. The whole list is worth reading, but a few items stood out.

On actually using your own product:

I estimate that less than 10% of PMs actually dogfood their product on a weekly basis. Use your product like a first-time user and write a friction log of how annoying the experience is. Nobody is too senior to test their own shit.

Ten percent. If that number is even close to accurate, it’s damning. You can’t develop good product judgment if you’re not paying attention to the thing you ship. And this applies to designers just as much as PMs.

Yang again, on where that judgment actually shows up:

Default states, edge cases, and good copy — these details are what separates a great product from slop. It doesn’t matter how senior you are, you have to give a damn about the tiniest details to ship something that you can be proud of.

Knowing that default states matter, knowing which edge cases to care about, knowing when copy is doing too much or too little—you can’t learn that from a framework. That’s pattern recognition from years of seeing what good looks like and what falls apart.

And on what qualifies someone to do this work:

Nobody cares about your FAANG pedigree or AI product certificate. Hire high agency people who have built great side projects or demonstrated proof of work. The only credential that matters is what you’ve shipped and your ideas to improve the product.

Reps and shipped work, not reading and credentials. The people who’ve done the reps are the ones who can see the details everyone else misses.