Well, a new character starts out with 20/20 STR/INT and that makes for a balance of Phy. 75%, Mag. 62%. If you keep the Stat Points even, that balance stays the same, from what I've seen.
So, naked, a 1:1 hybrid (same stat points for STR/INT) is normally weighted towards Physical by 13%. Maybe that's where the mechanics balance out a bit. The Mag. Atk/Def are slightly higher, but the balance is higher for Physical. UNLESS the player changes that balance by favoring STR or INT.
If the balances are used in damage/armor calculations then they would offset the high magic numbers due to the bias towards Physical.
Maybe....
