The play to please hands control over to others leaving the improvisor as vulnerable as a leaf in the wind being blown around by the opinions of others. When we value our work only on the opinions of others we create a cycle of vulnerability and need. We begin to seek out praise, adjusting our work to achieve the dopamine hit.
This can be very dangerous to people's self esteem and can create an opportunity for others to exploit and manipulate, especially if there are power dynamics, like casting, involved.