This isn't a Subaru poblem, but a typical 'con' with ABS. Everything is a trade-off. ABS can be fooled by bumps on the road, railroad tracks, snow,etc. The most common examble is that of trying to stop in heavy snow. ABS makes it worse, since it does not allow the tire to 'dig in'. This has been an OLD OLD issue since ABS first came out with ANY car.
The good news is your ABS in the Subaru is top notch and as most modern cars has 4 sensors.. each tire works independently... so the effect is minimized as much as is possible.
Don't like it? Pull the fuse and practice manual panic bracking. Personally, I prefer ABS. I believe its pros outweight the cons. I got a couple flat spotted front tires on my Miata once that really brought the point home ($$).
Rick