What strikes me most as a former professional in film audio postproduction are the national differences on intelligibility standards. German speaking audiences

What strikes me most as a former professional in film audio postproduction are the national differences on intelligibility standards. German speaking audiences (where I worked) are used to extreme standards of clarity, to the point where a studio recording quality is what you have to go for. Most German commercial shows and dubs would work just fine as audiobooks. Meanwhile in the US originals there is a litany of mumbling, half words, half sentences spit out, chewed down and all, not only would you have to force actors to do this over here, but everybody would also experience it as bad craft. Of course this comes from somewhere: recording clean sound on set where the microphones cannot be in plain view is challenging and overdubbing always produces a clean sound if tou don't put in work to change this. Few directors even in Germany are going to make a compromise on set if the sound guy complains (trust me, I have been there and I tried). The German speaking part of Europe as the biggest dubbing market of Europe employs 52% of all voice actors according to wikipedia. But in the end if an audience and a nation of professionals is used to do it a certain way, thay way might persist. US production companies keep getting away with this, so why invest more and risk for getting a sound that doesn't match a audience's expectations?