willie_901
Veteran
...And forever why would a pro need one?
...
Even pros make errors. Clients expect pros to be perfect.
Before digital, pros used Polaroid film backs to confirm things were right and consult with clients. Then they switched to negative/transparency film backs for the keepers.
On some gigs I used a real-time WiFi App to operate the camera and preview images. Clients loved seeing what the camera saw in real time ('Live View'). Some even walked through the scene and rearranged items while viewing the results in real-time on an iPad. This saved everyone a lot of time.
If your skill and experience level makes real-time image review redundant, than I truly admire the high level of competence you have achieved.