Yeah, not so sure I agree with this. I dig your sentiment, but like a lot of users in this forum I've done a lot of fixed gear riding, road and track. While there are things about it that make it inherently and objectively difficult, it's pretty easy at this point and doesn't require so much focus. From a routine ride perspective, mountain biking requires way more focus because the risk of crashing is so much higher if you're not watching your front wheel.