I would not even start to claim or state that a Mac makes any difference to what you can or cannot do, it’s a tool like any other, and if you think PC’s are the better tools for the job then there is nothing I can, or even care to say that will convince you otherwise!
The young lady you referred to sounds like she was naive and hungry, and maybe she did lack talent, but what has that to do with the fact that she used Macs? - she was deluded, and probably fed rubbish by her tutors who have never actually earned a living as an artist themselves, to think that Macs made any difference to how good she was! - lol! - but hey, there is one born every minute I am afraid.
Sadly, the inverse is also completely true, and what I get tired of, is the same silly statements made the other way:
“I know you Mac guys suffer the raw end of the deal when it comes to 3D software, things are slowly changing. But why suffer? I can safely say that Cinema runs better on a PC, the stability and work flow is much quicker.”
An ignorant and incorrect statement, coupled with some sarcasm for good measure!.
I could say that people that choose to use a Mac, generally do so, because they are tired of suffering PCs, but then that’s not your experience, so the wheel keeps turning…
Anyway - what was the topic again?