1. "Mythical Man Month" which is the shorthand for a whole book + concept that you can't just throw more people at a software development project and get linear productivity improvements as the communications overhead (meetings, emails, mistakes due to poor assumptions, etc.) deeply eat into the raw number of productive hours that a new person added to the team brings.

2. AI automation tools (Claude Code) are often described as a "junior developer" which is an imperfect comparison as while you could potentially sort of set them up that way many people use them as more of a singular force multiplier.

I use them to work on many more projects in many more ways and ship far more than I could even if I had a "junior developer" sitting alongside of me as there's not the same level of communication needed.