I don't necessarily interpret the comment you replied to as saying that "taste is not important", which seems like what you are replying to, just that it's not the only remaining thing.
I agree that taste gets you far. And I agree with all the examples of good taste that you brought up.
But even with impeccable taste, you still need to learn, try things, have ideas, change your mind etc.. putting all of that in the bucket of "taste" is stretching it..
However, having good taste when putting in the effort, gets your further than with effort alone. In fact, effort alone gets you nowhere, and taste alone gets you nowhere. Once you marry the two you get somewhere.