That's not to say that's your playstyle, but its the playstle of many-a-thief. Regardless, back before I.lv gear, Hands/Feet being swapped meant that you were, for an example lets say you were using EMp+2 Hands and Relic+2 Feet. Here's the differences.
Treasure Hunter Fulltime TP:
AGI+15
CHR+7
Acc+9
Eva+20
Enmity+5
TH+3.
Useful Armor:
STR+8
DEX+15
CHR+7
Triple Attack+3%
Increases Triple Attack Damage (+3%)
Accuracy+12
Attack+16
Enmity+4
Loss from Fulltime TH Gear:
STR+8
DEX+15
Triple Attack+3%
inc. Trp. Dmg +3%
Acc+3
Attack+16
Gains:
AGI+15
Evasion+20
1 Enmity
I.E Massiv Differences... Even before I.lv Gear. After Item level gear? Well use Iuitl Hands and Iuitl Feet, which will take you like an hour or less worth of effort to obtain. We'll not add Augments (Which would likely be Double Attack+2% each). But here...
Net Gains from Iuitl Gear
STR+19
DEX+47
VIT+35
AGI+28 (over raiders)
MND+34
INT+10
CHR+38
Attack+10
Evasion+53 (Over raiders)
Acc-1 (Asn+2)
m.eva+86
Haste+8