What's really under debate though is whether the grind if felt. People don't mind grind that they don't feel.
When you say 10/10/10 is less grindy than 0/0/30 without distinction made as to whether players could choose, that's a mistake. ArenaNet understood that. Both scenarios ask you to repeat tasks. But in terms of how it feels, if you can pick how to fill the counter it automatically feels less grindy because you will choose to go about however you enjoy it more.
And it is less grindy because say they don't fix the scaling properly, if you can't kill monsters then you can do something else to contribute. So you're not stuck there trying to catch monsters before everyone else, you can get yourself unstuck. If the quest had been "kill 10 rats, then kill 10 big rats, then collect 10 rat skins", at high population you would not be able to finish the two first parts.