I've notice that too. They are really slippery if your shoes are damp in the slightest.
Yeah, the first time my foot slipped off I was thinking something needs to be done, but there's always an issue with that.
If you get the best thing for slippery conditions (punched sheet metal), you'll tear up your shoes. If you get the best thing for comfort and appearance with driving shoes (stock), it won't be as slip resistant.
This is one of those times where a plain old ribbed rubber pedal cap is a fine answer. The stock units are arranged improperly; in other words, incorrect...
Wrong.
If they want the aesthetic wow factor, use an aluminum pedal with a deep, vertically ribbed cap. Done.
VW is clever, buy they do not know better than 150 years of trial and error. There's a reason nearly all pedals look like that. You can slip down if you're really greasy, but not sideways.
The base Golf pedals are a better design for casual shoes/boots. I might just move to those. Kudos to VW for giving one a bit of room around the pedals, though. My Danner Mountain Light II boots haven't interfered once the entire time I've owned the car, and they're Norwegian welt construction.