Better to give the up to date 2 min average magnetic wind on departure than the old 10 min average true bearing. Yes I know the ATIS wind and can work out whether there's a significant change but why bother performing that calculation up to thirty times an hour?
We're too busy for that and I normally have plenty of better uses for that thinking time.
A superfluous wind check is far less superfluous than "bye-bye" and "good-day" and all that stuff.
The wind is a more dynamic quantity than temp or QNH and changes more rapidly - it's a good habit to give it all the time.
If you're not in the habit, the one time you get distracted and fail to pass on a significant change may be the one time it'll feature in an incident report.