People who say "why does x champion get y, when m champion gets n"
...Because they're different champions, and balanced around different things. Do you want every champion to have exactly the same kit?
Recent example: why can you flash out of skarner but not Darius?
My answer: because they are different champions, and different abilities, with different mechanics
I think a much more reasonable argument is that you shouldn't be able to flash away because skarner needs help, not simply because that's how Darius is. It's almost like saying "why is Caitlyn allowed to auto attack from farther than Vayne"