Comment by danudey

One great way you can make things more secure is by reducing attack surface. sudo is huge and old, and has tons of functionality that almost no one uses (like --chroot). A from-scratch rewrite with a focus on the 5% of features that 99% of users use means less code to test and audit. Also a newer codebase that hasn't grown and mutated over the course of 35 years is going to be a lot more focused and easier to reason about.