I have a theory on this.
Newer yoyos are different in 2 ways.
- Finger-spin dimples
- Generally bigger, but usually lighter.
Most of the yoyos you mentioned (Genesis, etc…) were basically big, heavy H shaped yoyos that hit that 67g+ mark. yoyos today are just as big or bigger, weigh about 2 grams less or more and have shorter axles to accomodate the fingerspin hub.
Shorter axle = easier to strip
less material = more likely to take damage from hard hits
combine them and you can get a yoyo meant to take less punishment. Not saying they’re all this way, but if it seems to happen more often, I would say that this is probably the cause.
Oh and Bi-metals can be crazy fragile. Smack it off the ground and dislodge the ring and its going to play like hot garbage.