Long Tones: Are you practicing them effectively?

I recently stumbled across a video in YouTube with the title "The Only Long Tones Exercise You'll Ever Need". So naturally, I was curious to find out what that was.

Although, it was a good exercise I did find flaws in it and I decided to share that in a video of my own, with a Long Tones exercise I practice.

Of course, I didn't mention any names nor did I defame anyone. No need. We're all musicians who are trying to learn and do our best.