And, a beginner might not have accumulated enough ritual tools and can use mundane equivalents as interim substitutes. So, the closest thing I can offer to a response is that I find it a good idea if can be done, but it's not an absolute. I feel that my tools are an extension of my own corporeal power, adding their own element to whatever I'm doing. The key is to treat your ritual tools with respect and reverence. Whichever way you choose, I believe they remain powerful.
Ritual tools are symbols of spiritual energy and focus.
I never use my athame to cut day to day stuff, but I have used it outside of deliberate ritual space. I was using it in a sacred manner, for a sacred ritual task. I think intent is everything in magick. If your Swiss army knife is your athame, and you see no conflict cutting open cans of beans with the same tool you summon, stir and call forth with, then go right ahead. I do not believe there is an inherent magickal force which would conflict with the intent of the witch in that kind of thing.