Screenplays are not meant to be read, they're meant to be understood and produced. Your argument is akin to saying that blueprints are too complicated for the average person, therefore they should be changed. They're not meant to be understood by the average person, they're meant to be understood by industry professionals. Just because you find it less than readable doesn't make it so. Those of us who know what we're doing with it think it's just fine.
I'm sorry you don't find them easily readable, but they're really not meant for you.
That's nonsensical, unless you mean that they're meant to be mechanically analyzed—page counts, etc. that are obviously easier to accomplish without first printing them out. Even if they are not typically read in the manner of a novel, they're still intended solely for being read by human eyeballs, and for that purpose the typography is obviously deficient in ways that can be improved with no downside.
Repeatedly pointing out that the current system manages to work is not a refutation of the claim that it can be improved. Why are you so unwilling to admit even the most superficial of flaws in your industry's standard practices?