By switching between digital and analogue drawing tools, you’re translating the work between different media, and the act of translation is what smooths over the bumps of any single tool.
AI might eventually become good at fiddling with the béziers, but doing that part manually is an essential part of the process. If you don’t fully understand how the béziers naturally behave (and when to lean into or push back against that, for both aesthetic and technical reasons), the end result will be meaningfully worse.