C'mon Ken, I usually agree with you, but you are wrong here. Earhardt-Perkins isn't just terminology, it is a offensive philosophy. It has morphed over the years and decades, but it isn't that it just a terminology thing. Every system has it's own different elements that are specific to that system. Blocking schemes where sometimes you want small quicker linemen (EP) and others you want big maulers. Some systems rely on fast receivers who main job is to get open down the field. Other systems rely on quick receivers who need to get open quickly, but aren't fast down the field. Some systems rely gamesmanship of reading the defense before the play and making play adjustments after the huddle and before the snap. Others have receivers having a set assignment and the QB only having one or two reads.
Whether or not you think McDaniels' system is outdated for today's NFL, you cannot just retrofit it to be like the Shanahan or McVay offense. You can take some elements, but you cannot become it. The philosophies are way too different.