Lots of factors for them to consider HA, despite the slightly favourable wind on 27.
Runway surface condition, landing weight (which can be highly variable), MELs (were they dispatched with one reverser out?), what brake setting they want to use, is the plane going straight back out and are brake temps going to be a problem? And so on.
27 doesn't have huge amounts of landing distance to spare for a big jet under some circumstances. Even at domestic weights in the B767, which is no slouch when it comes to stopping, every so often I'd miss the 2nd last exit and have to roll through to the end (others are happy to slam the brakes on and throw the pax into the seat in front of them, but I generally tried to avoid that).
Request vs require - I always say "require" so it's crystal clear! Most often in SYD, where politics can make landing into wind a rarity and occasionally you just get sick of it.