Colorful words also do not belie the actuality of adding two numbers with the same precision as "multiplying" on the same device. The multiplication is nothing but adding lengths calibrated to Logs. I merely use the Log scale to add numbers. A slide rule adds.
I really hate to leave it here, because there may be some confused lurker who thinks you've accomplished something with this line of "argument." But I just can't waste any more lifespan on this elusive style of debate in which you specialize. It serves no useful purpose. Go in peace.
And it can be used to drive nails if you are so inclined, but that doesn't make it a hammer.
Note that in the instruction manual of a slide rule, nowhere does it mention using the rule for addition and subtraction.
That one CAN use it for addition is a curious coincidence resulting from the fact that the log scales are linear. Thus, though one could add with it, a slide rule is NOT an "adding machine" in the normal meaning of the term.