binge replying behavior?

From email we were informed about teacher’s recent illness. On the weekend, our absent teacher surfaced and replied to many discussions with very thoughtful feedbacks. I am impressed but can imagine the amount of work involved. However, such a “binge” replying pattern reminded me of one of my current TAs – she will reply to all students at once, after the deadline. I am not sure it adds to the richness of the conversations as much as it could if she does this throughout the week. Conversation by definition should be something that goes back and forth.