It would be nice to have a mirrored preview but a non-mirrored recording. I record vlogs and it helps to see my image mirrored, but then in the published version, I need the image to be normal, without mirroring. So there is a need for the preview to be different from what is recorded.
The mirrored preview allows the user to adjust their positions, gestures and expressions better as if looking at a mirror. Having a non-mirrored preview confuses the user as their movements are inverted. So a mirrored preview is needed. On the other hand, the audience needs to see the presenter without mirroring. It is especially important if there is a text on the background, or if a presenter plays the guitar.
The mirrored preview allows the user to adjust their positions, gestures and expressions better as if looking at a mirror. Having a non-mirrored preview confuses the user as their movements are inverted. So a mirrored preview is needed. On the other hand, the audience needs to see the presenter without mirroring. It is especially important if there is a text on the background, or if a presenter plays the guitar.