"Sharpening" is the process of grinding a bevel on a knife.
If starting with a bevel-less blank, you may need to remove a LOT of metal via grinding to achieve a sharpened edge. Depending on the thickness of the edge before grinding, your Lansky may not have a sufficiently low grit to take off material quickly enough to satisfy your needs. You are wasting your time.
The difference between a full-flat grind and a "scandi" or saber-grind is blade thickness and bevel angle. For two blades of the same width, spine thickness, and edge-thickness, the angle behind the edge-bevel will be greater on the saber-grind, resulting in a thicker blade everywhere but the spine and edge. One could make a saber-grind blade than is thinner/lighter than an FFG blade by using thinner stock-material or using a hollow (concave) grind rather than flat or convex. Most utility razor-blades have a flat saber grind.
A thicker blade has greater lateral stiffness and strength as well as weight, worse cutting efficiency - it is preferred where such strength is required, e.g. if the blade stock is very thin or the blade will be subjected to significant forces/stress.
A thinner blade is lighter, more flexible, more efficient cutter - it is preferred where strength and impact-resistance are not as important for using the knife, e.g. most knife tasks.
