[Someone]

One could have a language where object.method(args) does single dispatch on "defined in a class" methods while method(object, object,...) does multiple dispatch on generic methods.

That could get really confusing for the language's users, though, if there were name clashes between the two, and they would be there in any reasonably large program.

And of course, argument order already gives the first and last arguments special attention.

Another way to diminish that special-casing is going to the extreme other end: object.object.object.method(). Remove the now superfluous parentheses and replace the periods by spaces and you end up with Forth.