> Anyone who has been doing this professionally will tell you that the "last step" is what takes the majority of time and effort.

That's true, but even the "last step" is being accelerated. The 10% that takes 90% of the time has itself been cut in half.

An example is turning debug logs and bug reports into bugfixes, and performance stats into infrastructure migrations.

The time required to analyze, implement, and deploy those has been reduced by a large amount.

It still needs to be coupled with software engineering skills - to decide between multiple solutions generated by an LLM, but the acceleration is significant.