I absolutely adore 69, and have no issues with concentration. I suspect I would especially enjoy the mutuality with a man, where you can do the same thing to each other or "trade" actions on each other's cocks.
I think it's fair to say that one of the greatest sexual disappointments for me in life is discovering that very few people share my level of enthusiasm for sixty-nine. It doesn't seem like many women enjoy it except (briefly) as foreplay, due to the distraction issue, though some will tolerate it as an end in itself once in a blue moon. From the looks of this threat, sounds like not that many guys are into 69 either, at least as an "ultimate" act.
Fine. If I don't get to do it that much in life, I can write about it in my stories as much as I fucking want! You will notice that 69 features in a disproportionate number of my stories, often to orgasm. My 69th story (published earlier this year) was in fact an ode to 69.