Observing how I and others use knives has taught me things. One big thing I've noticed is that almost everyone I watch cutting things seems to instinctively use the tip of the knife the most. They pierce almost everything that can be pierced before cutting it. Which, if you study how you cut, actually makes a lot of sense. For example, try to cut open a cardboard box without piercing and without sliding the blade down a fold. It can be done, but you have to start at an edge and do a slice cut at that edge. Then it's easy once it's started. The piercing is all about getting the cutting edge in contact with the inside of the media. I'm making way too much of this.
My key point is that the tip and first inch or so of blades get used and abused WAY more than the rest of the knife. So it needs sharpening more often and more attention when you do a full sharpening. I notice this on my EDC blade a lot. I spend 2 to 3x the time on the first inch or 1.5 inches than I do on the rest of the blade because that part gets the most use.
Brian.