[amichal]

AND a several orders of magnitude larger investment in tech writers, and manual "How can my customer break this software" testing.

When I worked in shrink-wrapped software back in dark ages the documentation writing team and a very extensive manual QA department where each the same size as the development department. Think people trying for DAYS to find out why out of 100s of thousands of active users, a few dozen reported being able to launch 2 instances of the main window when that should not be allowed. (Fix: Race condition in the "double click" handling code with a window of a few milliseconds)