Copying text that is identical or similar from one layout to another is very nearly as easy as it is to copy from one place to another in MS.
We can have as many as 20 or 30 LAYOUTS in a file.
True enough and I utilize that on a regular basis, for a limited amount of items. The only real argument I see for not putting them in MS is the xref reason. It DOES make it easier to use it for an xref, however, if I might point out, generally a model is done representing the object, and it is xrefed into a drawing, different diciplines are added in the new drawing (as not to corrupt the xref) and notes pertaining to each dicipline is put in a layer dealing with that dicipline.
I regularly use 5 different paper sizes, each having its' need and none being disposable, if I put all text for example at 3/16" on a C size sheet and then the same size on a D size and then again on an E size, I would have issues with geometry interfering with the readability of the text on the smaller pages, because the plot is at a different scale, thus the text is not at a different scale. Perhaps my thought process is not correct but it has worked for a great deal of time and if I can place notes ONCE and have them reflected efficiently in ALL plots, it then becomes less efficient, more time consuming, and more costly to place them in all layouts, for example 20 times.