I wonder how much of this change is because he can no longer keep track of so much state in his head (or just doesn't want to). I only say this because I've go

I wonder how much of this change is because he can no longer keep track of so much state in his head (or just doesn't want to). I only say this because I've gone through a similar transition of valuing my mental computation time in the last 20 years of coding :). The efficiency of inlining is compelling when you code the whole thing at once, in one session. Once you decide to break the work up over multiple sessions, it's too much to keep in your head over multiple days (or weeks).