It's this. Right here... People want to jump all over the "learn chords" bandwagon. Most have no idea what the wagon is even hitched to...
Except we're not hitched to it because our position isn't, and never has been, "don't learn scales". As I said at the very beginning, scales are important for musical knowledge. They are part of basic Music 101 and will always be. But once one has Music 101 and moves into specialization i.e., playing bass in a semi-serious group, your job is clearly defining the harmonic content of the music, and that means primarily, not exclusively of course, chords. So it is perfectly acceptable to say that scales are of lesser importance as long as we aren't too wonky about it. I recommended Chord Studies for Electric Bass. Read the intro for it. It explicitly says it's not a beginner's book. It assumes you already know the basics and are ready to move on to the advanced stuff, the stuff that's going to be the working bass player's bread and butter.