We have been using the placeholder codes in our revision table and one issue we have seen is that if the revision description is longer than the size of the cell it overlaps onto the next columns instead of wrapping around. This applies to all fields that a placeholder code is used.
I have tested it with solidworks rev table format where the cell automatically wraps around and also with using separate notes with the word wrap setting turned on in sw properties for the note.
The other issue with sw formatting not getting applied to placeholder codes is that when using revision symbols with the rev table, the output does not have the text in the center and it get's offset beyond the extent of the symbol.