It works for trivial examples, but on anything complex... as you go 3/4 layers down and on longer / more complex functions, I suspect it quickly makes less sens

It works for trivial examples, but on anything complex... as you go 3/4 layers down and on longer / more complex functions, I suspect it quickly makes less sense... what about when that function references other stuff in its local context, etc? That is an amazing demo feature -- but maybe not as useful day to day versus just hoping around functions.