OK, but: As a (Mac) OS X developer, in 2003 I implemented a custom NSTextView subclass to fix two specific bugs that were impossible to work around otherwise. T

OK, but: As a (Mac) OS X developer, in 2003 I implemented a custom NSTextView subclass to fix two specific bugs that were impossible to work around otherwise. That subclass was used in everything we shipped for years and years... on OS X 10.3, 10.4, 10.5, 10.6, and 10.7. (After that I lost track, but I think one or both bugs were finally fixed.) I feel like maybe this change will make Apple frameworks more stable in the long run, but that will take a tech eternity (10+ years). In the meantime, the overall user experience will be degraded by system framework bugs that can no longer be worked around. It just sounds more aspirational than realistic. "Let's make it impossible for developers to work around our bugs -- that will force us to write perfect software!"