Advantages of having a routine.
Well, yes, it’s true that I’ve run the UGB200 and derivatives about six times (the one 650b DNF last winter doesn’t count as a full loop), and it’s true that this might be considered boring by people who don’t have my collection of mental tics (randonneuring is one of them, of course, but a lot of people have that mental defect so it doesn’t count) but, if you lose your cuesheet 15 meters into a 200km loop (and don’t find out about it until you’re another 500 meters down the road) it’s useful to have the routine because then you can do the entire R200 by memory instead of needing to refer to that now-vanished cue sheet.