Reverb amount controls a sound's perceived distance: drier sounds appear closer
The wet/dry ratio of reverb on a sound is a primary cue the listener uses to judge its apparent front-to-back distance. A dry signal seems intimate and upfront; adding reverb pushes it back into the ambient space, because closer real sources arrive with more direct sound relative to room reflections while distant sources blend into the reverberant field. The corollary: overusing reverb clutters a mix and removes the dry/wet contrast that gives punch. To keep a heavily-reverbed lead vocal upfront, add pre-delay (delaying the reverb onset after the dry signal) and balance the dry and reverb levels so the vocal sits comfortably over the backing.
Examples
Lead vocal at 100% dry sounds upfront. Add room reverb and it moves into mid-depth; a long hall reverb sends it to the background. Pre-delay recovers clarity while keeping some natural space.
Assessment
Given five elements (dry lead vocal, half-wet backing vocal, slightly wet snare, medium room guitar, wet pad), arrange them from closest to farthest in perceived depth and specify the reverb treatment that achieves each placement.