> good testers explore the space of possible inputs in a much more 'creative' way.
My point is that the extent of testing should depend on the actual product; eliminating all bugs is not the primary goal of every team.
Some companies might decide on other goals and prioritize e.g.: just paying users (giving them better support to resolve issues), or acquiring new users, or something else.
Software engineers tend to use products in a consistent way (based on how they know it's meant to be used) whereas good testers explore the space of possible inputs in a much more 'creative' way.