Earlier quoted context omitted.
That's not strong opposition there. One basically says it's boring, and the other says that only a certain technique can ever be good, and then it isn't even cited.
Professional pianist here. They are boring but that’s hardly the biggest issue with Hanon, unfortunately. The biggest problem is the instructions that the composer leaves for the student, which includes the insistence that the student lift the finger high off the keyboard with each note. I can think of practically nothing more injurious to good technique and nothing more likely to induce tension than this. Hanon coul…
Oh my goodness yes. I started playing on January and followed the Hanon instructions with the sheets. I have been trying to release tension, especially around my flying pinky… and realized that this way of playing Hanon was making it worse. I am in the process of fixing this now, and am enjoying less tension.