Can you see the danger here?
If you think that play refers to an opportunity to behave an irresponsible, carefree, childish manner... then you have got the wrong idea about taijiquan.
Play is about immersion in the event itself.
Students who want to talk rather than train (or dance around and act foolishly) are not in earnest.
They are not focused at all.
An inexperienced student cannot talk and train competently at the same time. If they are talking, then they are talking. They are not training taijiquan.