The envisionment of TK is to bring you what was promised by GSC for STALKER: Shadow of Chernobyl, instead of the gutted retail release we were left with. TK aims to cover every aspect imaginable from gameplay intended to genuinely scare the player, to graphics for the absolute best visual experience, cut mutants, absolute realism, optimisations, stability, and a complete game mechanics overhaul, all without breaking the story. The idea is to present the player with a complete retail experience for the purist that liked SoC but wished it was far more fleshed out. In no way what so ever does TK try to be like old beta or alpha builds of SoC, TK aims to enhance everything SoC already has - nothing more, nothing less.
As title says, doesn't really add much but it does reduce the steam rollered flat cardboard look many branches and bushes have due to insanely low poly meshes (or complete lack thereof). So, while the normal mapping does give some sort of 3D effect/look it also eats more memory but luckily due to all the optimisations I done in that regard I figured it might be worth digging in to some of the reclaimed resources.
I'll let you all make your own decisions about if the effect is worth the cost of using extra memory.