Hey!
You've asked a very good question and I think you'll find that people are quite torn on this issue.
1. Hanon etudes with the exception of the final sections are primarily white key drills which draws criticsm due to the fact that you are not running any scales other than C major. Can you transcribe them? Of course..
2. Hanon exercises have been criticized for their lack of musical substance. People often say they "space out" while they are moving through the various exercises. You can however vary the rhythm, dynamics, key sig. etc. to make them more interesting.
Bottom line, do you feel that you are benefitting from Hanon drills? If so, go for it! If not, skip them. Ultimately, it doesn't make too much difference either way. As long as you do something to strengthen your dexterity and tune your technique.
I find that playing Bach 2 part inventions is great for strength and dexterity. But, each to his own.
What's most important is that you find your time at the keyboard enjoyable. Trust yourself, if you're practicing things that are of questionable benefit to you, then you've gotta ask yourself why you are doing them.
Just enjoy your practice time!
Best of luck to you!