This is the wrong way to think about tool use.

You wanted this feature for years. You understood the problem, but the amount of time that it would have taken to properly implement and test it held you back from doing it. Obviously, anyone else who wanted this feature came to the same conclusion.

This new tool reduced the amount of time that it would take. So you used the tool. You used the tool to bring the feature into existence, checked the tests, and took enough time to ensure that it was good. You didn't lie about your contribution in the PR, and the maintainer deemed it acceptable. And now everyone has this feature!

When you eat a strawberry do you feel like an impostor for not growing it yourself?