Yes, I use those all the time for exactly that purpose. In many cases you don't even need to worry in which order to enter the operands when calculating a difference or ratio, just press negate or reciprocal if the result doesn't look right.
Yeah, having dedicated operators for going the other way just fit my mental model better for the types of tasks I had in mind for it.
Hmm, well then maybe it would be simpler to have a single button that swaps the input and the accumulator?
into and from may be easier for the average joe to read though