Most multi-tools carry a lot of stuff you dont need BUT they have some compact specialist items like chain tools and crank removers. Sometimes you need to apply 2 tools at the same time. I carry an old CoolTool (with adjustable wrench) and a Leatherman Mini (for the pliers).
Also
Spokey spoke key
Cassette remover (NBT2)
One cone wrench (the Cooltool acts as the other).