Witch as little to do with stats squish, yes the leveling is a bit more linear in terms of stats prog but the actual impact of the squish is mostly after lvl 80. There is tones of problems with low level content, don't get me wrong, but the problem behind the lack of good progression while leveling is here since at least cata not so much because of the squish.
Stats squish is a good scapegoat when in reality it has little to do with low level problems.