Well... I have my own reasons and normally I am not a fan of spin bowling. What I hate about Ashwin is the fact that Indian management prepares dust-bowls, so that he could take wickets. This luxury is not given to any of the other players in the XI. All the Indian tracks are doctored to suit the spin of Ravichandran Ashwin, as in normal surfaces he becomes toothless.
You are entitled to your opinion but Test Cricket is not about only Seam bowling. Spin and Seam both are Art in cricketing sense. @SaShiRaJaVu already gave one explanation in his response.
Please allow me to give another perspective. IMHO We all are hypocrites and have twisted standards in this regard. When subcontinent bowlers and batsmen perform in-home condition we criticize or judge them according to their Away tours performance and on another hand
Muralitharan, Warne, Ricky Pointing, Brett lee all failed in India but they are Legend in World cricket, don't you think its hypocritical behavior
Btw it also applies to me because I have written against Ashwin multiple times here.
That said, even before the start of the match I had argued for the inclusion of one more spinner in the playing XI. Jadeja as a part-time bowler failed to take a lot of wickets and conceded more than 100 runs. If Kuldeep Yadav was there to support Ashwin, then South Africa might have got out for less than 300, and India would have managed to enforce the follow on.
With all due respect. Jadeja is not a part time bowler in any sense when it comes to 5-day cricket. Part timers never bowl 37 overs in one day and FYI today he became the Fastest
Left Handed bowlers to take 200 Wickets. how many part-timers comes into our mind with this number? I agree he was rusty today and at some point, I also felt that India is one spinner short, but sometimes you should give credit to opposition batsmen too.