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Your idea is 100% true and everyone will agree with your idea. If the Indian team management had given importance to the team selection and chosen to bowl on the Ahmedabad pitch, they might not have performed so badly that day. Rahul Dravid's team selection was not wrong, but they should have considered the spin on the pitch that day. Only Virat Kohli, Rohit Sharma, and KL Rahul's contribution was noticeable that day but others contribution fully zero.
We can say if's and but's after the result but what team India did was right and they got bad day and unfortunately it happened on final. The same XI did terrific for the past 10 games so how can you guys justify that with one bad day and the pitch was supposed to assit spin but it didn't due to the dew factor so even if India played Ashwin it won't made any actual difference. Still India is the better team but Australia won the trophy and they managed by doing extra preparations and tactics to outperform the excellent Indian team where Indian team lacked but apart from that no one can be blamed, if one should be blamed then I would say the pitch curator for giving a dad pitch on the final day.