What interesting statements in absolutes. I have an almost entirely opposite view. To leverage the power of cad and minimise errors i try to use elements, including text, only once if possible. So such elements are likely to appear in more than one viewport.
I annotate in both viewports & design layers but mostly in design layers.
A couple of examples: common dimensions on floor & foundation plans, room names on floor and finishes plans.
How to achieve this: classes