Crib skirt: yay or nay?

Yaz • 28y | Baby boy born 12 June ‘19! 🧔🏻👩🏻🐱👼🏻👶🏻

What honestly is the purpose of one? I prefer the clean look of a neatly tucked in flat/fitted sheet, this skirt thingy looks totally unnecessary to me.

Just confused as to why such a thing exists 😆 Someone please explain! 🙏🏽