"Drag" is not always a bad thing. Intentional, controlled drag, can be a part of the presentation. A wet fly, allowed to sink, and then dragged back to the surface will appear as an emerger to trout and will be taken by fish feeding on emergers. A dry fly reaching the end of its drift, and then swinging across the current on the surface, can appear as an adult laying eggs, or as a dun trying to take off. I have caught a lot of fish "on the swing".
Life is hard. But it's a lot harder if you're stupid.