Comment by mablopoule

> Maybe more important than that, it's about taking the time to build the mental models that facilitate product development and the next iterations of coding.

For me this is the big one. When you code by hand something (especially at the start of a project / feature), it gives you times and opportunity to evaluate different approach, like data-structure or overall architecture. When you're given agentic-generated code to review, those choices are already been made implicitly by Claude, and while it give you the impression that you understand the codebase, you actually haven't been able to process the tradeoff.

Of course, not 'hand-generated' code has the same ROI, and when you're about to do something derivative of something you already understand, agentic development is truly a huge productivity gain.

For me this is the difference between 'vibe coding' and 'coding with AI': Am I able to predict in advance the code that Claude is going to generate, and more importantly, am I able to be surprised when Claude doesn't generate the code I thought it would have (sometime for good technical reasons), or am I just looking at plausible-looking code diffs, and accepting thing without being able to understand the impact on the rest of the codebase. This for me is way more important than what percentage of code lines have been generated by AI.

I've had the opportunity to try both approach: one where I was given a vibecoded project and told to maintain it with Claude: I knew the details of some features, but haven't worked with the codebase enough to really understand the architecture, or be able to mentally reason about the codebase when I'm asked a question during a meeting.

On the another re-implementation of the same product, I've been given more leeway to develop how I wanted, so I've handcrafted the first few features in a transversal way (handling the file architecture, the routing, the way data and components are splitted, and how the API calls are handled), and then I've used Claude to generate the other feature (most of them I knew to be derivative of the first one). In the end something like 90% of the code is generated by Claude, but the end result is both much simpler because I knew where things should be simple and where edge case where, and most importantly I trust what I've put in production.