I make the suggestion because the amount of time spent ranged is small compared to the amount of time spent in melee. The bow will get less use than whatever weapon is selected for melee. In my mind that means not emphasizing the bow but emphasizing whatever melee weapon is selected.
IMO 14 DEX is enough presuming that a +3 tome will eventually be applied to DEX. That gets DEX to 17 for GTWF. Enhancements from 6 ranger and elf are another 4 DEX taking DEX to 21. A DEX item gains another 6 for 27 total. Talking end-game gear it is pretty easy to get 1 exceptional bonus on pretty much any stat. An epic Ring of the Buccaneer from Crystal Cove is especially easy to come by for a 7 DEX bonus. That puts DEX at 28. Ship buff to 30, use a +5 bow or +5 enhanced arrows and you are looking at +15 to hit. Combined with nearly full BAB and elf ranged enhancements that is enough to get the ranged job done. At least that is my take on it.
FWIW, I can see the point others are making regarding scimitars or rapiers. The game does offer some easy to farm examples of both. I prefer the Turbulent Epee as it is a "boss beater" that bypasses both metal and alignment DR. I still think khopesh is the best choice and worth farming, crafting or the zillion Shroud runs needed to construct.
A 12 fighter is going to have 7 feats to go with the 7 every character gets. Most of the key ranged and melee feats will come free with the 6 ranger levels leaving IC:ranged, IC: melee weapon of choice, GTWF, Point Blank Shot, Precise Shot and Weapon Focus: ranged as the only "must have" feats. So 6 feats that are "needed" out of 14 available. That still leaves plenty of space for Weapon Specialization: ranged, Weapon Focus & Specialization: melee weapon, Greater Focus & Specialization: ranged and melee. That eats up 7 more feats leaving 1 available.
Assuming 2 monk for evasion and saves boost that is 2 feats used 1 on Toughness. So 2 feats to burn as you see fit. Probably 1 of those is Power Attack which can be taken as a monk feat. It leaves 1 feat for whatever.
There are some who feel AA must take Improved Precise Shot. To do that means a higher starting DEX of 16 and, IMO, that is too much cost in initial build points. Others feel you really need Stunning Blow. That's a reasonable point of view. Some might say grab an extra Toughness for 22 more HP.
Me, I like khopesh. But, I realize that there are different points of view and there is merit to each of them. Like I said earlier in this reply, I'd go rapiers with the Turbulent Epee if I passed on khopesh.
And, if I did that I'd probably go Superior Weapon Focus: ranged for another minor boost to my ranged attacks.
I hope that explains my thinking on this a bit more clearly.