Yes and no. My wife is a professor. In the experience of her colleagues, students who want slack/email feedback don't actually have the same definition of "asyn

Yes and no. My wife is a professor. In the experience of her colleagues, students who want slack/email feedback don't actually have the same definition of "asynchronous" that professors (or you) do. The number of emails received at 11pm regarding an assignment due as 12am is frankly outrageous. There is an expectation of extremely high availability when it comes to these kinds of interactions. So many professors create a blanket "come to my office hours" approach rather than trying to train students to understand that it might take them 24 hours (or longer - on weekends) to respond to an email.