A multi-tool wood saw gets used often when I am doing yard work. I don't always expect to saw something, but when the need comes up unexpectedly, I always have a multitool at hand. Sometimes I use it instead of a full size saw that might do the job more easily but don't feel like going back to the tool storage area to fetch one. Other times, it's the better tool for the job, like when dealing with growths close to fencing and other places inaccessible to a regular saw.
I seldom use the metal saw, but have in the past cut some pipe for a quickie plumbing repair, another time removed a metal piece from door hardware. While pretty sure there were other times over years, they don't come to mind at the moment. My impression, BTW, is that Vic metal saws work much better than Leatherman.
Although not often lately, I have used the files to shape or deburr metal, PVC, other plastic pipes and molded parts. Sometimes I use the wood file on my nails when a better nail file is not available.
I consider saws in a multi-tool more important to me than files, but I like to have both. You never know what's coming up.