Is B Paul?
Mix it all up is the gist of Dave Mac's book. As a caveat to that he also says focus on your weaknesses, and if you are able to drop knee like Edlinger and get shut down on front on moves with no footholds then some practice may benefit.
What a good thread.The vast majority of problems on my board have been worked out by either myself or Pete Chadwick. Pete is much stronger than me and much more willing to work his weaknesses. My problems - not really deliberately - tend have got a lot of weird body positions, flagging, hooking etc (not many real egyptians though) and are often feet follow hands. They often climb really well (for a board) and can look unlikely but are pretty repeatable once sussed. Pete's, in comparison, are often more basic. I have, I think, one problem Pete can't touch and a few he struggles on. He has probably dozens I can't touch. OK, so not exactly a controlled experiment (not least because Pete's technique is as good as he is strong) but it does at least call into question Bonjoys hypotheticals.If there are strong underacheivers then I'm probably your classic type who believes he can take refuge in good technique and not try and get stronger.
I think suggesting Malc is an underachiever is perhaps a bit harsh. Maybe he didn't reach his potential but he did disappear from climbing before every stagnating. I can think of a few things he's climbed that haven't seen any/many repeats. Maybe his sequences are inefficient but if he's the only one sat on top of the boulder then he's got something right.