As a designer who makes nowhere near $300k, please tell me where these jobs are that pay that much and let you break things.

Apple, it would seem.

As evidenced by all the posters here who didn't know about features, there's plenty of work left to do.

Indeed there is, but not in the area of adding more cryptic, convention-breaking features offering little improvement in the user's experience, even when they do not actually degrade it.