I think it's pretty obvious. After you've been coding for almost 2 decades across multiple industries, coding becomes predictable and tedious. By that point, you've become an expert in many sub-fields within computer science; you probably even started to forget some of the old technologies/methodologies that you used to be an expert at.
You come to understand that software development methodologies are just fleeting trends. Unlike with many other fields, the returns that you earn from investing in yourself as a software developer/engineer don't compound; they start to depreciate as soon as you stop trying to keep up with the trends.
The subskills that actually compound in value are things like understanding project lifecycles, building teams/culture, understanding good coding standards, CI, deployment, testing, quality assurance, etc.. These 'management' skills never go out of fashion.
You come to understand that software development methodologies are just fleeting trends. Unlike with many other fields, the returns that you earn from investing in yourself as a software developer/engineer don't compound; they start to depreciate as soon as you stop trying to keep up with the trends.
The subskills that actually compound in value are things like understanding project lifecycles, building teams/culture, understanding good coding standards, CI, deployment, testing, quality assurance, etc.. These 'management' skills never go out of fashion.