Craftsmanship
Fundamental changes are challenging because every new variable has exponential consequences, each forcing you to rebuild your understanding at every level.
In other words, when you change one thing, you change everything.
In my opinion the failings of many men comes down to their failure to decompose that old knowledge, and assimilate the new. For every creative endeavour is a matter of two acts — taking things apart and putting them back together. The art is how.
