I say its more technical(muay thai). Ppl just dont have the discipline and conditioning to do muay thai so they do easier sports such as BJJ. Like you said, there are alot of invisible aspects in muay thai. Also, alot of ppl lake the flexibility to actually through a head kick for example. Those BJJ blackbelts are trying to protect their ego. I have been BJJ for 5 years, muay thai for 3 years. I say muay thai is harder technically.
Something to talk about. Haven't u noticed?
Was always dumb.