Belts: Necessary restrictor of waistbands or meaningless accessory?

I've noticed a recent trend that has lost the use of the belt with tucked in shirts. While this may not be something new, it has certainly caught my eye as becoming more prevalent. Now I'm no expert on fashion, but from what I've gleaned from my 23 years on this earth is that a belt (or suspenders, but I'll not get into that here) is required when tucking in a shirt. If anyone else knows if the lack of a belt with a tucked-in shirt is not a fashion faux pas please let me know. Otherwise this new hippie trend is bound to drive me insane.