XLR cables are supposed to have the ground only connected at one end. Having them connected at both ends does not make them true balanced, it makes them poorly designed. People call headphones that have been recabled to accept + and - for each driver "balanced headphones". Get over it. No, you don't call speakers balanced speakers, because there is no recabling needed. If the drivers are being driven by a 4 channel amplifier, the system is effectively balanced as far as I and everyone but you use the term. There is no difference between speakers or headphones in this regard.
BTW. A dual monoblock is the same as one stereo amplifier... so no, that is not balanced. To go balanced with monoblocks you would need 4 of them.
Like you said before, you are being pedantic. The language we use in this hobby is basically created by us, so you can't go around telling everyone they are saying things wrong. That is Reks' job! [though at least he sticks to the English language proper]