> A lot of this is cargo culting to make vibe coding feel more serious and entreprise.

Those examples sound like responses to being swamped with LLM PRs:

* "every review comment separately" [so the bot doesn't get a chance to miss it]

* "a PR description be formatted a specific way" [so the bot has guardrails]

* "support requests have existing JIRA numbers etc" [so we can have a chance of understanding the context]

> The teams that have gone full specs driven development are not AFAICT more productive

I suppose time will tell. It's difficult to generalise my experiences beyond my immediate team/company/industry.

> In some cases development is now slower with LLM than it was before!

Yes, pre-LLM I wouldn't sign up for formatted PR descriptions!