1. The R.Atk path has R.Atk, R.Acc, and agi. If it is a R.Atk path then it should have R.Atk, R.Acc and str, not agi, as str governs R.Atk, it's simply the way the game was designed, there are other games where agi governs R.Atk FFXI is not one of them, nor should it be.
Except they didn't really come up with the names for these upgrade "paths", we did

And AGI does affect ranged attacks still, and is the most prevalent ranged WS mod, so... I'm pretty sure it's better off the way it is anyway