Simple is often erroneously mistaken for easy. "Easy" means "to be at hand", "to be approachable". "Simple" is the opposite of "complex" which means "being intertwined", "being tied together". Simple != easy
Simplicity is difficult because most of us are overcompensating for uncertainty. Adding something is easy. But removing something is hard, because it requires conviction. It’s easier to hedge against uncertainty, entertain multiple paths, and dilute your focus than to develop a strong opinion about what to exclude.