I don't HAVE to do it to understand what people say but, lip reading does make it easier for me to process the words faster. I learned to lip read well long before I figured out I was likely an Aspie.
In the rock branch of the music business, you spend a great deal of time in very loud environments and, even more time with earpieces or headphones on so, about 70% of your life you can't hear anything except what comes through the headphones or earpieces and the music that's so loud it literally vibrates your bones.
Most of us (those that are on or very near the stage during concerts) eventually suffer some sort of hearing damage. We naturally learn to read lips just to communicate but, even after we leave the stage for good reading lips serves us well. We at least have tinnitus and, possibly more severe hearing damage by that point. ( concert volumes are 100 to 105 dB in the third to fourth row of the audience seating, on stage the volume can peak at 150 dB. The loudest sound that can occur is 194 dB. Pain is felt at 125dB, and at 140dB even short term exposure with hearing protection can cause damage - we routinely endure painful volumes for hours on end, without hearing protection.)
So yes we read lips quite well out of necessity. Off stage and out of the studio, assuming I'm not jamming, I can hear fine (well almost, I do have tinnitus but, I have had it since I was 28 so, I'm used to that ringing always being there.)
Reading lips does make it easier and faster for me to process spoken words so, I prefer to do so, if possible and, I'm not fazed if a person only lips the words without sound, I "hear" them just fine.