I don't have a multitool and would never carry it everyday anyway, it's too bulky, it's still expensive and if you loose it you loose everything.
For opening cans, I have a (1 dollar?) p51 military can opener. It's tiny and light, costs nothing, and makes a cleaner cut. You can hang it on your keychain or put it in your wallet.
For scissors, I have tiny folding scissors I got from a cheap AMK Pocket Medic on my keychain.
For tweezers, I have good quality Sliver Gripper tweezers (about 7 dollars)
And I carry a one handed opening Spyderco Delica (plain edge) everyday. I don't feel it the way I carry it (as on Doug's picture) and it's very light.
How is that any different than losing your knife? You also have about $50 worth of gear listed and one can find a pretty decent multi-tool in that price range and you still are missing some sort of pliers, screwdrivers and a file. While potentially not necessary for survival, they sure make life considerably easier.
For me, the “bulk” of a multi-tool is easily offset by the fact I have 11-13 tools easily accessible.
As for the saw, believe me there's not much that can be cut with such a small length. To be really effective a saw should be ideally half an arm span long. The shortest useful saw is the pruning saw but you can do what it's capable of doing with a sheath knife. It's just quicker with it. The sheath knife is a survival tool while the pruning saw is a crafting tool.
While you aren't going to saw logs with it, I do find the MT saw useful for cutting 1" dia saplings for frame poles and the like.
While not the perfect tool for every job, its much simpler to carry a single piece of equipment Vs 13.