The Consilium who drew up the Novus Ordo Missæ originally planned simply to have the bread and wine placed on the altar and then a prayer over the gifts said. The reason was probably that offering a 'Spotless Victim' before the said Victim was actually present was thought a bit odd. But many felt that apparently abandoning any sort of an offertory was a step too far, and so the berakah prayers ('Blessed are you, Lord') were composed and then the orate fratres reinstated.
My quibble is that although the new berakah prayers are oblationary, what they offer is not the spotless Victim, but bread and wine. In what sense do we offer bread and wine to God, and why? The Mass offers Christ, the spotless victim; the people offer praise and thanksgiving, and their whole lives: their sacrifice is obvious. But is bread and wine a New Testament sacrifice? In this context, the Anglican fudge statement of we 'bring before you' this bread and wine (or whatever) would be much better for the 'offertory'.
It has been a modern (probably since Thomas Aquinas, or Peter Lombard perhaps) trend to identify particular moments in the Mass; now is the consecration, now is the calling down of the Holy Spirit, this is the oblation—I'm not really sure that the historical liturgy saw it quite that way, but rather that the Immaculate Victim was offered from the offertory to the communion (in time, while eternally out of time). A sacrifice of bread and wine simply doesn't come into it.
What do you think?
p.s. I hope you like the picture!