I'm sure they test some, & you might well be right, but to me, from the outside, it mostly seems like a failure to test thoroughly that's their main problem. E

I'm sure they test some, & you might well be right, but to me, from the outside, it mostly seems like a failure to test thoroughly that's their main problem. E.g., the root-login-bug slipping back in is inexcusable. That bug should've entered in a "make sure this doesn't" regress list and be tested every release. Yet, it wasn't.