[question] Deleting C++ settings from the package_id ; where to do it

Hi,

I got my memories in a twist this morning trying to explain this to someone else.

I'd gotten used to modifying the package_id in the `package_id()` method of a recipe, such as removing settings that weren't necessary (including things like `header_only`). But then noticed that the recommendation (and our previous usage in recipes) of marking a package as a C library, is to delete them in the `configure()` method.

https://docs.conan.io/en/latest/reference/conanfile/methods.html#configure-config-options
and
https://docs.conan.io/en/latest/reference/conanfile/methods.html#configure-config-options

Can someone remind me of why `configure()` is used?

Is it just because it's executed that much earlier in the package creation?

Or something to do with consuming recipes?

Or something else?

Thanks,
Mark

- [ x] I've read the [CONTRIBUTING guide](https://github.com/conan-io/conan/blob/develop/.github/CONTRIBUTING.md).