Ur not getting it breh
1. Did u not read manga or watch ep he had to master it 1st he cant breathe or see,breathe or hear when he phases period and if he doesnt phase right it will make him pop up to surface as a rejection
How the hell isnt that worst quirk of all time his own classmate said so breh
Before he could even master it he had to build his own body up which is why he can still go quirkless
I get what ur saying bout deku and all but u cant sit here and tell me if mirio was in same position as deku with his permation quirk he would be dead quickly its y its not the same
He out here out fighting villains as stevie wonder basically
From his classmates perspective Mirio's quirk looked bad because he couldn't use it properly but it had clear potential to be overpowered if it could be mastered. He loses his senses but he also can't be hurt by an enemy while it's active. That's a fair trade.
Mirio is 18 and always had his quirk. His father had it too so he was able to learn and work at his since he was little. He's probably had 10 years to develop plus he's been with Nighteye for a minute.
Deku only had 10 months to train with All Might to inherit his quirk. He was in the hospital every time he used it and has the scars to show for it. Then he's facing villains before he even had a handle on his quirk. Mirio hasn't faced that level of danger. First big battle and he lost his quirk
You see why All Might passed on him. Mirio was that prep school kid who had schooling and trainers. Yeah he worked harder than most but you know something's missing and he'll get exposed in the league. He needed a kid like Deku who came out the mud because he's better prepared for the hard times