a) Arguments don’t work because team doesn’t listen and/or doesn’t want to change because they wish to stay in their comfort zone.
b) The responsible manager is incompetent and/or does not understand the things he/she’s responsible for and/or is a micromanager which kills any spontaneous action.
c) Those who see a bigger picture do not care to or cannot explain it and/or keep it a secret.
d) Sometimes the best option is to just do it (and improve it later) instead of going through a slow and energy consuming process of gathering consent etc.
e) Software architects