Sorry to hear of your injury, and I hope you’re feelin better soon. Fwiw, the R70x and 6xx are both headphones I’ve seriously contemplated, and heard many good things about. I have reservations about most headphones though, including these.
At some point though, you have to bite the bullet and just dive in. I was pretty close on a couple models during the July 4th sales. Just couldn’t quite make up my mind which direction to go before the sales ended. So I’m taking a more considered look at the units that seem to fit best with my needs. What this has to do with measurement myths, I dunno. But it’s Friday night. So there ya go!
A couple other threads here that you might (or might not) find relevant to your musings about cost and EQ-ability.