Agree, but would want this to be a user setting. Many of our users are complaining that they hate this. The new task look&feel is also causing some UX issues where tasks aren't sorting properly (even if you click to sort by Task ID column).
Being honest, I would love this option to be at the user level. When I'm at my desk with my big monitor, full screen isn't needed. But when I'm working just off of my laptop, I can only see like 3 tasks. It would drive me nuts if I didn't have full screen as an option. Maybe it can be like Resource Planner, Team Working On, and Calendars where you have a button to make something full screen.