Yes.........I agree. But there should at least be a provision to play seventh chords this way too. Major and minor isn't enough. I play more seventh chords than minor ones.
Of course now that I have been learning "all" the chords and using full finger mode, I probably wouldn't be satisfied anymore having only 2 or 3 types of chords to choose from. Full chord playing isn't thst hard to master if you practice. "Single Finger" mode really isn't 1 finger if you use minor or seventh chords..............so how hard is it really to learn 3 note chords........
then four? I still kick myself for being so stubborn and not learning full chords earlier. It was just so easy to be "lazy" and use 1 finger. But I tell you.......learning all those "other chords" (diminished, augmented,6th, 7th, 9th ect.....) has really added a lot to my playing and enjoyment of music. It even changes the way a style pattern can sound, especially when changing the bass. Once you discover this it's hard to go back to a simpler mode.....even if it is easier to play.