- It does not harm anyone (as retired maps are saved either way),
- it is extremely useful (In point of fact, my Runescape map project entirely depends upon it),
- and it has been around for a very long time (see https://www.warlight.net/Forum/49421-make-parallel-version-map)
- It also allows templates not to break entierly when someone makes a small adjustment to the map.
I honestly even thought this was common knowledge.
Please don't remove it. It will set me back enormously.
Edited 3/15/2017 18:17:41