I sort of get what you are going.
Spork… I think this is hype. For me a spoon works just as well. If I could use chopsticks, they would even be lighter.
Swiss Army knife… my razor blade does the same thing 90% of the time, but the scissors are nice. On long trips the scissors are better for trimming finger and toe nails, and the tweezers are useful, but I only use a razor blade on short trips.
I use a pot of some sort to boil water for FB cooking, and also use it as a mug.
Poncho/Tarps are great multi-use, but stand alone rain wear and a larger tarp work better.
For the most part, multi-use items come with some inefficiencies for individual tasks. To me the on true exception is a bandanna. I can find dozens of uses for it.