What I would like to see is a reliable distinction of different types of panics. In the environments where software I write is typically run, panics due to heap allocation failure are generally acceptable and rarely an indication of fragility. (By the time a heap allocation failure occurs, the computer is probably already thrashing and needs to be rebooted.) On the other hand, other kinds of panics are a bad sign. For example, I would frown on any library that panics just because it can't reach the Internet.

In other environments, like embedded or safety-critical devices, I would need a guarantee that even heap allocation failure can not cause a panic.