Remathilis
Legend
I think it's especially worth noting that you seem to heavily overstate the importance of racial stat bonuses, which aren't as big a deal as some will have you believe. This failure of your argument is especially obvious where you consider Dwarves not to make good Defenders.
Dwarves make decent defenders because of some of their traits and feats, but they don't grant a bonus to any of the defender "keyed attack" stats (Str for fighters and wardens, Str/Cha for paladins, Int for swordmage). Their con bonus helps axe/hammer-fighters, earth wardens and shielding swordmages, and wis helps both paladins and fighters (Combat challenge) so they aren't as bad as I stated.
Still, dragonborn, genasi and goliaths all make equally good if not better defenders.