Odd situation that ATC sets the PIC operational limits, 30kt Xwind should be routine in today’s airliners.
Although same situation some years ago, operating into Syd with B744. SYD ATC mandated the Holding fuel that we must carry, perhaps many hours before before planned arrival, not the operating PIC.
Then, when first contacting SYD en route you might get a message “expect 15 mins Holding at Parkes”. Advising ATC that we would reduce to Min Cruise and linearly absorb most or all of the delay, the reply would be that we would still get the delay whatever time we arrived at Parkes???