Brian Chesky (Airbnb CEO) says he reviews everything before it goes out the door (I'm sure that's still at a high level).

Product managers are the defacto but they can often always want one more feature before it's "just right" and, therefore, be slow to ship.

Technology leaders know the features intimately well and if they're ready for use but are typically abstracted from the customer.

Who is the person best situated and with the right mentality to say "ship it"?