I was always taught that the wind instrument check should be part of your scan when issuing takeoff clearances anyway - and simple mental calculations of +/- 10degrees or 5 knots, well, are simple.
But wouldnt you agree that it is alot easier to include wind when issuing takeoff clearance instead of checking the ATIS and comparing it to the current wind. And i think the pilots would be alot more interested in the current wind than the wind that can be up to an hour old. EVEN though the change is not significant. Remember, a change of 5degress and 5kts (not significant) crosswind can mean alot if the breakingaction is poor..