Part of that is because the sound volume is just so drastically different compared to normally talking; microphones have trouble with it, audio amplifiers end up clipping [0], and most speakers would blow out if the amp didn't clip (especially for the larger guns). And, assuming none of that happened then, just as you would have on a gun deck, your listeners' ears would be damaged. So the sound of gunfire in media is quieted.
Most people simply aren't around guns in the first place, let alone firing guns (eg, going to a gun range with friends/family/etc even if you don't own a gun), to understand just how much media misrepresents it.
Instead of a silly overacted action sequence where the hero darts around killing everyone with miraculous hip-fired headshots, instead you hear a sudden jarring crack-FWOOMP followed by an intensely loud tinnitus ringing. It takes half the scene for the ringing to slowly clear while the hero somewhat realistically tries to escape without harming anyone or blowing his cover, while also staying out of the line of fire.
It was so against the norm for action sequences that it nearly broke the immersion for me until it settled in how well put together that scene was.
Even firing a large calibre rifle with hearing protection is something you need to get use to. Not only the noise, but the pressure wave and recoil feels like someone just punched you.
Archer kinda gets this more-right than most things, LOL. "MAWP! MAWP!"