What happens though is that it's presented as a one size fits all approach, to get people improvising without having to take on the whole burden of chords, scales, and harmony. What sounds good when used sparingly over the three dom 7 chords of a basic blues progression, just sounds amateurish and bad when applied constantly to everything. That's a bush league approach. Not going to work on "Autumn Leaves", or, for that matter, even on actual blues progressions like Straight no Chaser, or Nows the Time, or any number of other tunes that deviate from the I7, IV7, V7 pattern.
This my comment that overuse of the blues scale is like taking your plate with steak, broccoli, potato, carrots and peas and just pouring ketchup all over it. Keep the ketchup for your French fries.