For the vast majority of people, Wassen is very readable. The same cannot be said concerning most of Piper's writings.
One should not readily discount as too simple the readable in favor of the more difficult. Being harder to read and understand is no virtue in and of itself.
I almost think that if Christs sermon on the Mout was printed for the first time, some of the posters here would claim that it was 'seeker friendly' and not true to the 'true faith'. The Sermon on the Mount is laid out is very simple and easy to understand words.
That's most assuredly not true.
Too likely true about the Sermon On The Mount.
Sigh.
I find Piper very readable. But, that is me I guess.
Perhaps the Puritans have conditioned me, but he seems much easier than Edwards, I will say that much...lol.