You miss my point. I'm speculating that what we classify as humanoids (stands upright with two arms and two legs) may be a common form of advanced life in the universe (i.e. the universe is ripe for the development of this type of life) and the Old Ones based the Eldar on those pre-existing versions of forms which probably shared many traits in common with humans. I'm not suggesting that the Old Ones based Eldar on homo sapiens that evolved on earth.
I realise this is just my interpretation and involves a lot of blank filling on my part but it makes more sense than the old ones creating a race with two arms and two legs with no reference to any previous life forms and then homo sapiens evolve completely independently on earth and just so happen to look superfically very similar to Eldar. If Eldar aren't based on a pre-existing form of life then why bother with sexes at all? They may as well be genderless. That is why I maintain that they are a 'perfection' of naturally occuring species.
And it is on topic - it's just that my convoluted explanation requires us to veer off on to these tangents .