Let's first take a look at a traditional ceramic tile backsplash installation. Depending on the size of the area to be covered, you may need hundreds of individual tiles or dozens of webbed tile sheets. You need to make sure the backing surface is nearly perfect in being clean (nothing can be left that will compromise the adhesive properties of the mortar), solid (no loose chunks of wall board or holes) and smooth (ridges or imperfections may make individual tiles protrude). Then you need to mix the mortar. Then you need to apply the mortar to the wall using a trowel - and a different trowel may be needed depending on which tile pattern you're using. Then begin applying each tile, one by one (or tile sheet, one by one) using spacers on each tile depending on the tile design and your attention to detail. When you come to an area that requires a tile to be cut (like an electrical outlet), you stop and measure and cut the individual tile to fit into that area. Assuming you are a skilled tile installer, you'll use either tile nibs, a manual slide/snap cutter or a wet/table tile saw to cut the individual tile. Once the entire area has been covered in tiles, you wait until the mortar is cured - usually overnight - before grouting.
Now let's look at installing Six3 Tile. Depending on the size of the to be covered, you may have four to six full tile sheets to install. The backing surface can be in almost any condition* since you'll be essentially recovering the whole wall with a new surface. It should be relatively smooth and solid but by no means perfect. You don't need mortar. You first measure the area onto which the Six3 Tile sheet will be installed, cutting out any electrical outlet areas. Then staple the sheet to the wall and move on to the next sheet. You use spacers only on the gaps between the sheets, not each individual tile. Before you know it, all the sheets are in place. You don't have to wait for mortar to cure because you didn't use any. You can begin grouting right away. Then you're done.
*Tub surrounds and shower backer walls need to be water tight.
As a time comparison, the kitchen nook pictured below measures about 50" long by 14" high. Six3 Tile's standard herringbone was installed by this writer with "handyman" level skills. One full sheet and another quarter sheet all that was needed. The two outlet cuts were made on the single sheet. The second sheet was cut to fill out the space to the opposite wall. The time it took to fully install and grout - from moving the appliances away to plugging them back in - was 1 hour, 17 minutes. And that included travel time to my cutting area and mixing the grout. Try doing that with individual subway tiles arranged in a herringbone pattern and coming anywhere close to that time!