Lap Sap, yes and yes. The strictest letter of ICAO however does require a reason to be given for vectors. I use 'sequencing, turn/speed .........'. We do same numbers and then some at our place and i note noone argues. I can only imagine the hilarity if some one tried on the **** about getting dicked around on freq that is a normal occurance at 'certain' places
As for runway/taxi way design lets us acknowledge that high speed exits useable by the aircraft requiring the greatest distance behind are key. EGLL has that sorted. Also the location of inner holding stacks. Will be interesting to watch with the altimeter changes and stack redesign as to how it runs especially in high winds.