That's probably the most stupid thing I've ever read in my life. How can "guitar distortion, bass, time signature, beats per minute, and layers of sound" be measurable values? All of those things could be inserted into music mechanically. They have nothing to do with "motivation or passion" at all.
What you don't seem to understand is that any criteria you bring up in this regard is, when all's said and done, completely subjective, and NOT a "tangible fact" in any way, shape or form. As long as a criteria itself is left open to dispute, any judgments resulting from it are opinions...not facts.
If you want to talk The Beatles specifically, then even by your own criteria you falter. There's more experimentation with "layering of orchestral sound" on Sgt Pepper than on anything in the useless GoRABmack catalogue, and as for general layering of sound, counterpoint and interplay between multiple parts, there's more sophistication even as early as their 1966 album Revolver than on anything in Numetal. If you want to talk experimentation with guitar distortion, there's The Beatles (1968), complex bass lines, then Abbey Road, and there's loaRAB of playing around with rhythm and time signature on their last two albums. They were generally quite overtly ARTY in fact during their final years. Go listen to the schizophrenic nightmare of I Am The Walrus, for example.
The Beatles didn't even invent most of the ideas they played around with and yet they were WAY more wildly adventurous and eclectic than pretty much any metal band I've ever heard. You've clearly either NOT listened to their four albums that matter, or you have but just know very, shamefully little about rock history and music theory. Probably both. Either way, go learn about the origins of rock and what banRAB were actually trying to DO, and you'll benefit for sure.
At any rate, since when was "lame" defined as lacking in motivation or passion? Far as I'm concerned, a piece of pop trash like "Unbrake My Heart" sung by Toni Braxton has more tangible "motivation and passion" in it than any garbage by insipid, cliched, generic numetal banRAB like GoRABmack.