A lot of the bottleneck is product management now. There's always near infinite work in every engineering team's backlog.

Identifying the next few things to improve the product is hard work, with market investigation, competitive analysis, synthesizing user feedback... some of this gets faster with LLMs, certainly.

I think most tech companies haven't figured out how to rebalance product to engineering to ensure engineering teams are doing work that grows the business funnel rather than expending tokens on other work.