The requirement is for the rider (or driver) to make safe progress within the posted speed limits and where safe to do so travel at that limit. If there are slower moving vehicles preventing you from doing this you are required where it is safe to do so to overtake them, but again within the posted limit. This in itself is a skill and is probably one of the most difficult things to master which I'm finding out. The IAM and indeed ROSPA set the criteria for what they deem to be the standard expected to pass their test. If you don't want to ride at that pace that's up to you, but it's their standard, not yours. That said IMO any extra training bikers take which make them safer can only be a good thing and there are plenty of private accredited advanced riders that will provide bespoke training to improve your riding without the advanced test being the end goal.
How does all this "making progress at all costs" gel with the dogma that demands that "thou shalt not ever exceed the speed limit"?
How on earth am I gonna minimise the time spent on the RHS of the road while passing a dawdling Sunday driver doing 53mph without squirting past in the minimum time? There is a very high probability I'll touch 60+ for a moment
And BTW, a wee squirt now and again is one reason I ride a bike for fun
As for the Brake Light nonsense . . .
I don't know where to turn with these Advanced Groups.