[JacoboJacobi]

I don't really see the influence of things like LLMs (or StackOverflow or improved search engines) as simple productivity. People do what they can with very complex value estimates and comfort levels. If they are less productive in a careful measure it may mean they are doing a lot of high value low hanging fruit across areas they were afraid to touch.

The trouble with highly productive specialists is that they produce a ton of high quality results where the demand is not really there and has to be artificially made. Even if you find enough work for them it often means the incremental cases are things you wouldn't have bothered with. A specialist branching to work slowly in related yet further related areas is a lot more value and can work with an oracle so flawed that it barely beats chance..

With juniors it is much more complex, but they have always been a useless consideration in productivity. Not having them has always been highly productive in the short term but has long term consequences.