I begrudgingly feel that things being good enough is they main why. And I say begrudgingly because it means less and less are caring about excellence while more and more becomes trash.
Fuelling it is that there are people in the “I want my <$500 things to last a long time because they should last” and people in the “If there’s a QC issue or it’s not as advertised I’ll return it, and if it breaks after I use it for a while I’ll just get the then-current one which will be better anyways”, and almost no one in between.
In our current society people with funds and not time see a clear ROI for shooting for 80% success because it means not having to spend time thinking or sorting out logistics.