Well.... it cuts.

Therefore it has a role. I usually carry a Kershaw blur, or a SOG II flash, or some other single blade knife. Occasionally a knife with 2 blades (a la SAK).

In daily life, I've never needed pliers. I've never needed tweezers. I've rarely needed an eyeglass screwdriver (which the tip of a knife can do). I've never needed a full size screwdriver (which is in my toolbox at home, or in my car). Or a saw. Or a file. Or a bit driver. What the heck are you doing where you use a multi tool so often?

So why carry the extra weight and bulk?