based on some of the uses you describe... longer folding knife = longer edge lets you split a chicken finger for your son in a single downward chop instead of a long draw or push cut with a shorter blade, longer handle for a more comfortable grip. assuming you use the longer knife the same way you use your shorter ones currently, it will spread the wear/use out over a larger area so you can go longer between sharpenings/stroppings. the longer blade may also allow you to use the folder in your pocket in situations where you previously had to use a specialized/different tool with longer reach. I don't have any justifications for why I carry the knives i carry other than "a pocket knife comes in handy sometimes, and i like this one." I like longer knives because the longer handles are more comfortable for me and the longer blades work better for kitchen/foodprep tasks (and are more fun for destroying junkmail/other playing with knife for the fun of it tasks). office tasks typically don't need a long blade, but they are more fun, especially if you hum the theme song from "Attack on Titan" or "Sword art online" while doing them.