Replacing Sandbags with Barricades and Barriers now no longer leaves a hole in your line
Small Turrets can be replaced with other Small Turrets and Large Turrets can be replaced with other Large Turrets without reducing your firepower during the replacement
Upgrade from a Small Shield to a Large Shield without letting raiders take shots at your defences in the middle
Want to go from planter boxes to hydroponics to ecosystems over your whole playthrough? There's no need to tear down your entire food supply, just replace them one by one instead
You shouldn't have to leave giant holes in your power grid as you're upgrading from Solar or Wind or Watermill to their upgraded versions. If you had to deconstruct instead of just replacing, you might risk damage to your valuable Psychoid.
Same goes for Wood/Chemfuel/Helixien Generators. It's common sense, the power grid isn't meant to go down while you upgrade it
As above, so here as well: Your pawns shouldn't forget what a Workbench is for just because it's gone from using electricity to Helixien Gas
Why destroy one battery before plugging a more advanced one in? Just built the new one first then throw the old stuff in the garbage
New Gas Powered Sunlamp with the Great Replaceable Taste
Having both Simple Utilties: Wall and Replace Stuff used to break the ability to replace a wall underneath the Over-Wall cooler, but since I'm so nice I decided to fix this for you
Just bee happy that when you want to upgrade your beehouses you don't also have to be a busy bee re-injecting all those bee's back into their new shiny houses