Why do some people refer to influential Buddhist groups as shantou, or "factions"?(GDD-0268)

"Indian Buddhism was split into twenty schools after Shakyamuni Buddha's death due to the fact that different places with different customs, different conventions, and different needs required that the application and interpretation of the Dharma be carried out from different viewpoints. Similarly, within the Buddhist community nowadays, different big monasteries or organizations may be using different means or methods to do their own things, but they share the same basic ideals and principles as Buddhist groups. "