Interesting example. Why would you say VSCode is a mess? I feel like it's not in line with the current UX Zeitgeist I assume you're referring to (touch-first, wasteful whitespace, manipulative patterns, reduced functionality) at all. It provides multiple layers of access to functionality that allow the user to choose their trade-off between discoverability and speed. The UI is compact with very little padding and shows a lot of information at once. No affordances to touch input are made either.

Another powerful tool that is built on modern UX principles would be Fusion 360. In my experience, it makes me as a user much more powerful and actually provides more functionality in a more productive manner than its competitors and predecessor. Would be interested in you explaining how that UI is a mess as well.