1. (dplumb) We definitely don't want the nightmare of DEFPOINTS . Just something smarter like "unreferenced views tags" which shows up but we can opt to print or opt not to print.
2. (steve.thorne) The traditional way of working is have markups on pdfs, docs which everyone using and its hard to keep a track . specially multple users working and reviwing drawings becomes another task. Good you pointed to have the " markups flow back and forth between two programs" that would be amazing..Linked markup files, ongoing, in progress, completed and easy to see the actual revisions whenever required.
3.(samuelsanf) Am currently using drafting view for starting view...
Ex: I have a central file with 5 linked revit. to have consistency on the drafting view, I have kept a " Reference notes, useful info" using " Project based Symbol" and it shows up on starting views of all the files. .consistent. So many advantages to have "Starting View"
4. We are already used to a. Reference point. b. Reference lines c. Reference planes....so probably something like reference text..