One thing I always thought would be interesting to do is make it such that the "enforced stylistic" bits of a language were tied to the optimization settings.

One thing I always thought would be interesting to do is make it such that the "enforced stylistic" bits of a language were tied to the optimization settings. For example, make warnings not halt the compile on the compiler's equivalent for -O0, and then on any higher optimization setting, they become compiler errors that can't be turned off. It doesn't completely prevent people from doing stupid things (e.g. deploying a debug binary to production), but it's, in my opinion, a good way of solving exactly the problem mentioned here.