>> easier to put on edge on

> The corollary to this is that they lose their edge quickly, which is annoying.

Part of making a knife easy to sharpen is the materials. Your claim applies pretty well here.

Part of making a knife easy to sharpen is the geometry - specifically: a very small secondary bevel. Depending on the geometry, "easier to put on[sic] edge on" is only loosely related to "lose their edge quickly".