Replacing curtains with doors has been something I have always done. Living in a one-bedroom apartment I know the drawback of doors. When you really want that open, light, airy effect doors can just feel so solid. The first thing I do whenever I move into a new place is to remove any doors that don't serve the purpose of providing necessary privacy or quiet – I keep the bathroom door, keep the bedroom door and the rest are gone. I am anti-door.
However, it is nice to have the option to cut off an area should you need to and that's where the trend for replacing curtains with doors comes in. You still get the option to open up the space, but curtains are softer and more flexible.
