Imagine that your company is young, lean and quick while everybody else is old and big and maybe a bit lazy. You'll inevitably become a bit lazy yourself, never thinking further than "old and big and maybe a bit lazy" when everybody else is doing a thing one way. Why waste energy on looking for other reasons they might have for doing it that specific way when you already have a perfectly fine explanation? A perfectly fine explanation that is also irresistibly flattering?

Telling apart "rules" that exist because nothing else works from those that are just inertia is difficult.