My current thinking is that sometimes deadlines are needed and Scrum can make that happen. However, the deadline you get from the engineers is going to be vastl

My current thinking is that sometimes deadlines are needed and Scrum can make that happen. However, the deadline you get from the engineers is going to be vastly slower than if you'd let them just do the work and tell you when it was finished. I know marketing lines to pretend that they can't do their jobs without hard engineering deadlines but marketing is overrated anyway. Ask yourself if you really need a deadline or if you're just slowing down engineering with your incompetent management.