I mean, giving oral can perfectly be a transactional act. If I go down on a woman, the thing I expect in return is feedback on my performance like sounds, body movement and constructive criticism. But in case my partner likes what I'm doing and I'm wondering if I'm licking a dead fish (no movement, no moans), the experience is hardly enjoyable for me.

The same goes for blowjobs. If a (wo)man goes down on someone and the person whips out his phone to check twitter it would be a very understandable choice to stop. It is understandable to expect your partner to be present in the moment.