You queue for the highest dungeon your level bracket allows by itself. When you are running the random queue you are really only trying to get the bonus anyway, right?
That's basically how I leveled all my classes. Why would you want to continue to use the random queue to level when you could be put in a Satasha at level 40, where you won't even get level appropriate drops?
Do you not realize that you have now basically lost the ability to do that?The only reason I ever use that checkbox is to help people in my Linkshells finish instances and I like the ability to do that. If it can be used solo to run the daily roulettes more quickly, then I can see it's value there as well. It's a feature I like in the game. As I said before, I think if you did the free-for-all randoms, you'd see an increase of withdraw/abandons.