Okay, quick and simple one.
Before, mirroring cubes only really applied to computers and displays. These days slabs are a much more common build element, and if you don't have mirror cubes on, bad things happen.
Nothing quite like sitting back all satisfied after a long day's build thinking you did a job well done, and then notice that mirror cubes was off and you have to fix every slab you laid.
So, turn it on by default?
Before, mirroring cubes only really applied to computers and displays. These days slabs are a much more common build element, and if you don't have mirror cubes on, bad things happen.
Nothing quite like sitting back all satisfied after a long day's build thinking you did a job well done, and then notice that mirror cubes was off and you have to fix every slab you laid.
So, turn it on by default?