The biggest problem with pencils is that you can never use all of them. There are always leftover stubs that become too small for your hand and must be thrown out. It may be not a big deal with graphite, but what about colored pencils that can be quite expensive?
I learned to split the stumps and either crush leads from them for backgrounds or use them whole in a clutch pencil. But apparently there is a better way to fight stump waste: a Tsunago sharpener that actually creates a never-ending pencil. I need to try it!