Note that the whole point of my post is that there are different risk profiles for different kinds of software (or even within one kind of software--e.g., the data security subsystems in saas apps have a different profile than the UI widget library). If the parent's point is "some bugs are serious!" then that's not a rebuttal to my post--don't use weak type systems for those projects or those parts of the project. You don't rebut "You don't have to write all software like it is space shuttle software" with "some software is space shuttle software!".