For one, even if you don't spin away the hazards, it's entirely possible to get Charizard in before rocks are up. Say their rock setter is Skarmory. Xatu, for example, can either force it out or straight up kill it with Heat Wave. I'll use Gigalith as another example. No Magic Bounce user can take it out due to its high attack, but you can still prevent it from getting rocks up. Gliscor can Taunt Gigalith, and proceed to poison it or wear it down with Earthquake.
And as Dirge said, it doesn't use up a turn to mega evolve.
252 Atk+ Twistedspoon Deoxys-A Zen Headbutt vs 252/252+ Golem 36.5% - 43.1%
Zen Headbutt has the same effective power as Dual Chop, while Twistedspoon mimics Tough Claws. Also, Deoxys A.
I understand that you said Focus Sash, and not Sturdy, but does anybody even use frail suicide leads for Stealth Rock anymore? I know there's a few Spikers that do that, like Froslass and Accelgor, but nothing is coming to mind for SR...