For what it's worth, I see it differently.
This is just a special case of a measurement problem that permeates all of table-top gaming, and it's a way bigger problem in Warhammer for instance (loads of stuff has a range of 24" and that's the standard starting distance for encounters):
If two units/models start at a distance of x inches, any measurements of x inch to the opposing model will fall short an infinitesimal small amount. That's the concensus "there" - the situation is exactly the same as here with Malifaux though and I know the arguments for both sides, but in the end, it falls down to a consensual definition of it.
As a "special" argument specific to Malifaux: I don't think it's coincidental that (for instance) Fuhatsu's push is 3". This way, he gets out of the range of pretty much every melee engagement, and I think that's on purpose, but alas, this is pretty much interpreting the designers' thoughts, and thus, moot, but take it as food for thought.
Whatever it may be: I was just chiming in to say, that not all players might follow the way here presented. I certainly don't (for no tabletop game, that is).