If you don't try to win chasing 300 with 10 wickets in hand and 90 overs to go on a flat pitch, then on any other pitch, you will aim for a draw upfront. In most cases, if you are too defensive, you will get a ball with your name on it. Have seen with Pujara in this series and countless others in past. Also it lets the bowling team get on top as now they don't have to worry about losing option, it is just a win or draw for them.
I would rather have the team try for a win and win some and lose some rather than try to draw out every such game (and still draw some and lose some).
This is just my view, not saying it is necessarily the right view as everyone sees things differently.