Splitting 100-lines-long function into let's optimistically say ten 5-lines-long functions is only a win in readibility if you strongly restrict the number of w

Splitting 100-lines-long function into let's optimistically say ten 5-lines-long functions is only a win in readibility if you strongly restrict the number of ways in which these 10 new functions can be combined (by scopes, typing, good naming conventions, etc.). If you just extract the functions and change nothing else - you have 50 lines of code to read instead of 100 but you have 10! possible permutations of these function calls instead of 1 to think about.