I wouldn’t really say damaging to the hobby. But this is coming from somebody who lived off of these as a kid. My initial intentions was to get a Yomega Brain yoyo as I thought the sleeping was exclusive to that yoyo (had never actually seen a yoyo sleep before seeing a Yomega Brain in action). Honestly I thought the Yomega Brain was basically a yoyo ball with a delayed return. Turned out I didn’t have enough allowance to get the Yomega brain and my birthday was a few weeks away…so the parents said “just wait and see what you get for your birthday.” The impatient kid in me decided to see what KB toys had and ended up buying the Imperial where I learned the magic of sleeping and doing a proper throw. That same day within a couple hours of walking around in the mall with my parents and going into stores I had zero interest in being at, I had self-figured out walking the dog and the cradle/rock the baby.
For me it was a gateway to this hobby. Today I still see it as a gateway, something that a parent might buy for their kid on impulse since it’s a cheap non-electronic toy that might pull their kid off that iPad or Xbox…if the kid manages to learn how to use it and get addicted like I did even with just the basic gravity pull and basic tricks and especially in today’s times, look up on youtube to see more yoyo tricks, they might be inclined to buy a better model…but that Duncan Imperial/Butterfly would have served its purpose, introducing them to the hobby on the cheap.