Gear grinding has nothing to do with P2W because everyone has to put in the same amount of effort/time in order to acquire the gear. With P2W however, some people might have rich parents who give them plenty of cash, while other kids might not be so lucky. Some people might make minimum wage, while others might make $100+/hour. This is why it's unfair to have P2W. Time on the other hand is the great equalizer. Everyone has the same amount. No more, no less.
Ya... he's gonna try and pull some "Not everyone has the same amount of time."
Funny thing is, there are 24 hours in a day for everyone, it just depends on how you use them.