My exprience has been that companies actively work to prevent people from becoming more than just code jockeys. For example, most of the places I've worked have viewed code delivered as the ONLY metric used to evaluate performance. Attempts to contribute to roadmaps or strategy are ignored at best and punished at worst.

Yeah, 95% of the available advancement in computing is in people management, not technical mastery. Businesses much prefer to hire externally to serve any non-core capabilities, especially to minimize internal culpability should anything go wrong. That leaves little opportunity to think outside the box technically.