The thing with system design is that all typical problems has been already solved, there are already battle tested patterns and practices for virtually any problem you can face until you're ~ at the scale of Google. You don't need AI for that. And if your problem is new or unique, AI isn't gonna help much.

Preparing docs, requirements and diagrams isn't the time consuming part anyway. Talking to the right people, getting management approvals, changing other teams priorities etc is the time wasting part, the technical one is already solved.

AI makes lazy people more lazy.

Most people, even if they are “smart af”, are lazy.

Accountability