I've fallen into the trap of similar thinking as the author, and I agree, the main issue is believing that mindfulness is a panacea. The more we suffer the more we hope for simple solutions. I really wanted to believe that meditate more == be happier. For my neurotic and driven personality, this meant obsessively meditating, and I began deconstructing and disidentifying from every negative emotion using mindfulness. I got to some interested states from that and felt like I could "overcome" any negative emotion, but my general sense is my practice was imbalanced and I don't feel like I'm much better off... maybe a little disassociated from reality. Most serious meditation practitioners are aware of pitfalls like this though, it's known as "spiritual bypassing".

Meditation is just another tool, although a very powerful one. Use it wisely.