> But if we define a "good product" to mean a commercially successful one
Why would we define a "good product" as a "successful product"? These are 2 different things. There are many ways to define a "good product" (is it useful? is it well made? is it innovative?), success is something else. All combinations of good-bad / successful-unsuccessful are possible.
Why would we define a "good product" as a "successful product"? These are 2 different things. There are many ways to define a "good product" (is it useful? is it well made? is it innovative?), success is something else. All combinations of good-bad / successful-unsuccessful are possible.