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In short, because all has been said already: smooth and rich gameplay, great battles and wonderful atmosphere! Truly this is a god-tier mod.
This mod is a must to include in a Fallout 2 playthrough. It hugely upgrades the game on so many levels. Better economy, harder combat, amazing crafting and lots of other things... I can't imagine playing Fallout 2 without it now, if you're reading this and haven't tried it yet - check it out!