Audax Oz and RUSA both seem to be a bit nitpicky with intermediate control closing times. Audax UK ignores intermediate control times (and only suggests routes). ACP used to be fairly tight with control times but has become pragmatic and in the last couple of PBPs, officially nitpicky but actually quite relaxed.
It is a little annoying if you've busted a gut to stay inside the printed limits while somebody gets more sleep but in reality, what somebody else does isn't relevant to the validity of my ride.
I do wish that they'd get rid of the sliding minimum speed requirements at PBP. For quite a while, our group was riding very close to the time limit but finished with 5 hours in hand, all gained in the last two stages, despite actually slowing down to escort in some friends. The 1200+s I've ridden with a constant minimum speeds are much nicer, due to less sleep deprivation early on.