Today, we often add or rename atts 30 revs into fmw design -- we then have to "know" all 19 of those and go visit the writer and cognitively hit the plus, find each of the 19 in the pile of 100 to make sure they make their way into our schema. I currently keep track of these elsewhere and then go visit the writer.
Automatic isn't a good option for this, as it adds things we don't want (intermediate substrings and calcs, source purposefully unused, atts accidentally not removed, etc.). Automatic also jumbles the order again -- which we may have just spent 15 minutes ordering.
Similar to symbolizing by category in ArcMap, with the underlying data changing later.......you can hit Add and it will only show you what has fallen out of symbology.
I would prefer there was an add atts button in writers that would show me only the unused atts. We could pick from those and add only what we want to the end of the list -- then move them around from there.