the point is, doing so is a very BAD thing. Perhaps for example, the MS store will always "update" and overwrite everything, including removing your mod folder. Secondly, even for the steam people this IS ultimately a good change. Those who don't use mods won't care. Those who do and especially those who play on multiple mods at a single time can now do so and take up far less hard drive space and much easier switch between the multiple mods you play.
- install mod to a folder somewhere, so for example d:\7d2dMods\DarkenssFalls
- make NEW windows shortcut to 7d2d executable
- edit shortcut and add a parameter to point to the location of the Darkness Falls content
- rename shortcut "Darkness Falls - 7 Days to Die"(or whaterver).
No extra time or space on your hard drive required