Another thing, the arrow in the example is pointing the wrong way as the point should face where the wind is coming from, not going to.
I noticed this trend in display style, as well. I think you and I are "old school" and understand it points opposite of the way the wind is going (rewording intentional). I remember needing to learn this characteristic as a young man.
It appears we are entering a Least Common Denominator world, where it's simply easier to reach
the broader public than it is to train
the broader public. Intellectual "Collateral Damage" of the Internet Age. The practice is spreading, as you noticed. Even the Wunder Weather Station has an internal display screen that mimics the Wunderground style gauge, and it is a solid, well-designed product. The reasoning behind the WWS decision is sensible; the reasons behind the reasoning are not.
I'll admit with some chagrin, this subject had me imagining ways to make a mechanical wind vane that points with the wind. I think it is do-able, although I've not yet made a prototype. My guess is the traditional pointer is a historical consequence from the days of bows and arrows.