I’m a bit surprised by your question and the responses…If you think about ’verb as an acoustical phenom, which it is, then the way you go about using artificial reverb should be informed by that fact. Granted, for purely synthetic music and a synthetic feel, you may want add reverb piecewise, but often that produces a jumbled and disjointed soundstage. Many engineers create an imaginary space, with reverb on the 2Mix, plus panning and EQ for distance/placement cues on the track, placing all the players in that space. Side benefit; you don’t have as much to worry about when creating an aural “pocket” for a particular instrument.
Bottom line: How and when you use artificial reverb really depends on the style and genre. Many, many amazing records were made with only a plate or foil on vocals and the rest of the ambience produced by musicians playing in a real space and room mics+bleed providing all the ambiance. With practiced players, who know how to “work” a mic, and the right mic choices and placement, even the plate is optional unless (again) you’re going for a particular feel.
Realize that, during tracking, many musicians need reverb in their foldback to ease their performance, but that doesn’t or shouldn’t need to be printed on the track.