That's related to not remixing the audio from the cinema release where the audio mix is targeting a dozen 15,000 watt speakers the size of a bus around a massive theater. The dialogue is almost always coming just from the front center channel, which is often the weak link in most home systems, overpowered by even the other front channels.

Not sure how many directors are involved with those decisions once it gets to the home release level, I would bet a very small percentage though. Especially directors that have been very vocal about the experience of the theater release being their focus, like Nolan.

It's more likely the studios are just doing the bare minimum to throw it on a Blu-ray with some extras, maybe a commentary track.

On a related note, switching your audio system to a night mode usually fixes this issue because it compresses everything, bringing the highs from things like explosions down and the low dialogue up. Switching out of fancier audio options to something like stereo also usually fixes this, again because it's remixing everything to come from just a couple speakers instead of the specific ones the surround mix wants. Not ideal obviously, but that's what the studio decided would be the home release.