Are hiking fanny packs actually worth it instead of a backpack?

For short day hikes and fast-and-light outings, specialist communities like r/Ultralight and r/hiking strongly favor hip packs for snacks, phone, keys, sunscreen and a small water bottle, citing far better ventilation and accessibility than a backpack or hip-belt pockets. For longer trips needing layers and more water, reviewers recommend a larger lumbar pack or pairing the hip pack with a daypack.