I reckon it comes down to how quickly you can become familiar with moves. Working hard boulder problems its easy to put 20-30 attempts in in a session, whereas routes this would take multiple sessions. Boulderer/route climber argument doesnt really work for me. You can usually build up a pretty decent level of p eng in 3-4 weeks, enough for most british length routes. So its just a matter of pulling your toe out of your minge and puttng more hours in. Andy is a good example of this, he can boulder around v8, and casue he puts the effort in he, can get up 8b's
like GA, which relates quite well to that boulder grade. Also.. how well do you really know a route? And how well do you chill out when climbing it. I reckon most people are pretty chilled when bouldering, thus, free movement, clear headed, no pre judgement of success etc, all that hippy pyschology bollocks. Not as easy when you got the redpoint fear! My kinda of problem with sport is, my brain is set up for trad and the frame of mind you have to be in to push it on trad, thus breaking those insticnts is hard on bolts. When i do switch off, its suprises me that with a bit of hard work and learning a route where you can start to get to. Hmmm