Development, in the old sense of adding features and fixing bugs, is over.
Today, an API that used to let us fetch YouTube subtitles without restriction, Google's InnerTube API, suddenly started returning 400 errors unless you provided an authentication key. A lot of YouTube subtitle libraries are wrappers around that API, so this kind of issue is usually not easy to fix right away.
Still, I asked coding agents to solve it, almost recklessly. Codex spent about two hours obsessively attacking the problem from every angle, and eventually implemented a custom server-side library by copying how the Android YouTube app fetches subtitles. If a human had been doing this, they probably would not even have thought of that approach, and even if they had, implementation and validation would have taken at least several days. This is simply the era we live in now.
Boldly asking for what you want, insisting on a high enough bar and good enough taste to reach the level users will actually pay for, and then systematizing that. That has become the developer's job in the new era.
And that is also the essence of management.