How will Ninja Gear work.

[Reynhart]

How so? The STR doesn't benefit NIN and the DEX doesn't benefit MNK.
(yes, impacts parry, but cmon.)

Sorry, but 200 more stat point is gigantic. It'll more than double the parry rate of MNK and the parry strength of NIN...without sacrificing their main stat.

My thought is, mnk gear will be given dex, and mnks will have their main stat changed to dex.

Jobs aren't "stat based". STR doesn't increase "DRG Damage", it increases "close range attack". Since NIN is a close range job, it's attack should be tied to STR, and it woudn't require any change on MNK stuff.