Completely agree with you. But bowlers shouldn't be picked just on the basis of their pace. Whether the selectors pick genuine fast bowlers or swing bowlers, they should be ready for international cricket. Both Yadav and Aaron were picked a bit too early. Aaron has lacked control after he was injured, he needs a bit of time. Yadav looks all right for tests, but for the shorter formats, there are much better options. And its a very wrong belief that on overseas tours, only genuine pace bowlers can trouble the batsmen. In fact the English, South African and Australian batsmen won't find it too difficult to deal with quick bowlers unless they are up to the mark. They face some good pace bowlers even at the domestic level in difficult conditions, so don't think they can be beaten with only raw pace. Like someone had said before, Zaheer has been quite successful for India, not the quickest Indian bowler.
And our swing bowlers are ignored at times, Praveen Kumar's performance is a proof that even a medium pace swing bowler can trouble the batsmen if he's good enough. There were a few eyebrows raised when he was picked, but he did exceptionally well in whatever chances he got. He did well even on the WI tracks which don't assist pace bowlers.