It was a perfectly good choice of words. The construction is informal but grammatically correct. OK, I wouldn't include that kind of thing in my PhD thesis. I wouldn't be including "OK" either. And I wouldn't be including "I wouldn't be including." And I probably wouldn't be starting a sentence with "And," though there's nothing wrong with that. And I wouldn't be using "wouldn't" or "there's," preferring the full written-out forms. Thing is, context is everything, the point being to communicate ideas in the most appropriate way for the circumstances. I don't think about rules and I think there's more to clarity of expression than abiding by strict and narrow definitions of words. Imagine the soullessness of a performance of a Beethoven symphony in which the players all regarded the score as a mere collection of thousands of musical notes which had to be literally and mindlessly rendered. I'd rather not.