[rhelmer]

While it's true that not all bugs are created equal, we do know that some bugs are exacerbated by architectural problems (single process versus multi-process is a good example of this), and new approaches like what Servo is doing in Rust make it possible to write parallel code in a way that is less likely to crash, and less likely to lead to security vulnerabilities.

In general, existing bugs (that I am aware of) are either not actionable because of existing architectural issues, or just because the nature of the bug is difficult and requires an expert whose time is constrained.