TL;DR
Title says it all; rail-like draggable and smooth wall building.What ?
Walls implemented as rails, which allow for clicking one side of placed wall and dragging it to create angled, rounded, and/or smooth wall sections (but still somewhat 1x1 in size per segment as possible or not) that connect with each other.Why ?
1. Practicality. All of the turrets have circular range of firing.2. Convenience. Placing walls one by one most often is done by running in one direction to ensure proper placement and corners are to be either square or awkward, with square not as well covered in terms of range, and awkward looking like pixel art gone wrong.
3. Aesthetics. More options for decoration.
I shouldn't but... maybe belts too? :^)