If you're writing OSS code or software projects expected to be used by others that may have constraints like that, then by all means the code that gets output matters itself. But even still I'd argue that the cost of writing code manually to get there is still a bottleneck.

It goes without saying that agents have little to no product sense in any discipline. If you're building a game or an app or a business, your creative input still matters heavily! And the same is true for code; if the software is your product, then absolutely the context missed by skipping the writing process will degrade your output.

That doesn't mean that writing code wasn't a bottleneck even for creating well structured software projects. Being able to try multiple approaches (which would have previously been prohibitively expensive) can in many instances provide something a room of bickering humans never would have reached.