Because cinema is supposed to be immersive, it’s supposed to take the audience into the action, it’s supposed to make you feel like you’re there. Dynamics play an important part of this.
It’s not enough to acknowledge that there has been an explosion or a monster has screeched, it’s important that the viewer feels in danger, like the monster can actually harm the viewer. To get that adrenaline pumping.
Ofc when your levels are ridiculously exaggerated and you stretch over to the volume control all the time, then the immersion is broken because instead of watching the film you’re too busy riding the fader.
Well, it’s now cinema is supposed to be.
Ideally they could make two mixes, one for serious viewing and good systems and another for bringe watching or bad speakers. But since that would cost more money and isn’t done, a good dynamic mix is preferable because you can always throw a compressor and some limiting to a dynamic mix, but you can’t recover information after it’s lost. And as a film and series enjoyer I don’t want my experience to be nerfed.
As for ads, I have no idea? I haven’t watched an ad since I got internet many years ago. Idk how you’re getting your media, maybe get an adblocker or use torrents?