I disagree with articles like these, and a lot of the similar advice I see on here.
I wish my parents came to see me play soccer or run track when I was younger. I would have loved that they cared enough to bring me to practice and watch. Other kids feeling bad for kids whose parents watch is completely irrelevant if those kids enjoy their parent being there.
When it comes to my kids, we have completely open relationships. They determine how involved they want me to be, and I truly listen to what they want. My older DD wants me at her practices. On the common theme here I tried for awhile to pull away. I made a point of saving all of my errands for practice time. DD noticed and asked me why I did that and to stop. I told her that people say it's better for parents to distance themselves from their kids sport, and she told me in no uncertain terms that she wants me there because she wants to be able to talk to me about her gymnastics- the good, the bad, and the scary. She also said that she knows we only get to have this particular relationship for awhile more and she doesn't want to grow up sooner than she has to. This is why, at 13, she still has mornings snuggles in my bed and I read to her every night.
Now my younger DD has different feelings on gym. She wants me around but not watching, and I usually sit in the car and read/make phone calls. She wants me to watch open gyms, however, where she shows off all the things she is learning without interrupting her practice flow. I don't think the problem is parents watching or discussing gym with their kids.
In my opinion, it's a problem when they aren't listening to what their kids want, and when they start to internalize their kids struggles and successes. Every kid, every situation, every parent is different, and have different needs.