Admittedly, I'm not aware of the Beijing issues, but Disney California Adventure has some awful outside-world-intrusions including the pesky power lines that once went through the DL parking lot where DCA is located. They now skirt the southern edge, well within view of much of the park (though beautifully blocked in Cars Land, a triumph of sightline mitigation as I even think particular peaks may stick up higher to block individual towers).
But the 1980s Pixar Place hotel looming over, within view while in half the park, is pretty bad.
So while I'm a bit concerned about potential issues in Epic, seeing any same-park attraction or show building will never be as bad as these outside intrusions, and I also know there's only so much that can be done even starting with a blank slate. Yet as someone fascinated with the art and science of theme park design, it's hard not to wonder what will and will not be an issue (what else am I going to wonder about for the remaining 5 months? So much has been answered.
).