The pvp in this game is horrendously unbalanced to start with, and that has to do with the classes themselves rather than what weapons they wield. It’s also true in some regards for pve as well (see - meta classes)
And if you ever bothered to check the damage formula, you should know that the physical/magic attack is extremely important. Stats don’t actually provide much in terms of attack.
Regarding the enchant jewel stats…you can have those damage decrease enchant jewels in any armor piece, if you so wish. 5 enchant jewel “slots” is enough to get all the important ones, anyway.
And you’re saying yourself that people still use two handed weapons classes…it’s just that they abuse autoswap to do so, since they can do it. If anything, they should fix autoswap so that you can’t have the advantages of both one handed+shield and two handed weapons.
Either way, you’re getting that additional socket, enchant jewel and awakening, and that thing seems to have ichors of sort. Thus even the stats will likely end up comparable.
So why should two-handed weapons + ornament end up having better physical attack than one handed+subweapon (not shield, of course; that should have inferior attack on lieu of giving better defense)? If they’re supposed to be comparable as well, then that ornament is totally overtuned by now. But fortunately is still in test, so they can tone it down before the release (and require substantial enhances and trascendences to do so - even the costs must be comparable, after all).