I am a first year math phd student. I could get a scholarship from my government and notified the director of graduate studies of my department (which is now my provisional advisor) that I wish to decline my TAship position for the next term. He advised me to think more about it and told me to think about it 2 more weeks. He told me that I should keep being a TA.
Well, my TA duties are a burden and I do not learn nothing of math from it. Besides that, it drives me crazy. I do really detest having to deal with those undergrad students. I prefer to devote myself to learn and then do my research. But my advisor wants me to think more about it, Why? If I am not a TA, I could have more time to work on my advisor's projects. Besides that, I do not think my department would have any trouble to find another TA. My school is not Harvard but it is ranked among the 30 best of USA, so there is a lot of people that want to be a TA there.
Why does my advisor want me to keep being a TA?