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On the way down it's easy: because the air compresses and heats up to the point it becomes a plasma. And despite that we associate it with a glow, it's actually perfectly dark (there are free electron bands in it). In other words: it blocks every frequency, and lasers, if you want to go line of sight.

Now you can get better quality with better receivers/transmitters, but I guess it takes a lot of engineering they didn't do yet.

Here is a manual to the Falcon9 which talks about how they do it. It’s all digital S Band https://www.spacex.com/media/Falcon_Users_Guide_082020.pdf

And yet the live video from the Moon was higher quality using analog: https://space.stackexchange.com/questions/2993/how-did-nasa-...

I feel like we have made negative progress in this particular area.

bluetooth has always been pretty bad.