Who does typical code sweat shops churning out one smallish app at a time and quickly moving on? Certainly not your typical company-hired permanent dev, they (us) drown in tons of complex legacy code that keeps working for past 10-20 years and company sees no reason to throw it away.

Those folks that do churn out such apps, for them its great & horrible long term. For folks like me development is maybe 10% of my work, and by far the best part - creative, problem-solving, stimulating, actually learning myself. Why would I want to mildly optimize that 10% and loose all the good stuff, while speed wouldn't visibly even improve?

To really improve speed in bigger orgs, the change would have to happen in processes, office politics, management priorities and so on. No help of llms there, if anything trend-chasing managers just introduce more chaos with negative consequences.