The Mister Handy Type 2 (seen in the classic Fallout games) do not have the buzzsaw or the flamethrower and are mentioned to be more like repair/handymen type of robots than butlers. Even the way the Type 2 float is better designed, it is two "propeller fans" (I don't know how to describe them better in english), while the type 1 is some jet propulsion system (imagine the damage to the floors, furniture, ground, etc that would cause and how many fires it would start). Even the "arms" in the classic fallout games type 2 are just six arms with a "hand" at the end, so they can grab and operate tools or other objects, while in the type 1 they have three arms but no hands (or do they have one? I can't remember anymore) and I have no idea how they would grab things or do stuff like washing dishes or carrying stuff.
The butler Mr Handy (Type 1) is a Bethesda creation and makes no sense.