I'm pretty confident that, presently, with AI, I get more done than I could with 5x hours, but less than I could with 20x hours, and 10's a nice round number.
Nah. I've committed over a million LOC in the past 4 months, discounting personal projects. LOC is a fuzzy measure that doesn't tell much, but, it's easier to mention that than to describe the details of my work.