^I find that true for most shoes under about the $800 mark. They use pretty standard and seemingly thin outsoles. You can always tell when they aren't oak bark tanned because they get very slick and slippery. Oak bark soles get a kind of "nap" on them almost like suede. It helps a lot for traction, and honestly, way less slippery than dianites.
I think that's a fair assessment. It isn't only AE that uses outsoles that are below traditional oak bark tanned (like Baker's) or Redenbach quality.
The good news with AE, at least, is that you can have them put on a Redenbach sole when they are sent in for recrafting (assuming you use their recrafting service). Of course you can always have an aftermarket cobbler do what too.