TN-S is a better (as in slightly safer in one particular respect) system than TN-C-S, but needs a lot more copper. So we use TN-C-S, which is good enough. TN-S is really impracticable as it makes distribution unwieldy and hard.
TN-C-S is the standard wiring method used within the USA, the UK, Europe, New Zealand, Australia, and most civilized countries of the world.
The -C bit means that the functions of neutral and Protective Earth (ground) are combined on one conductor, as is the case with the service supply. The -S bit means that from the service, the neutral and protective Earth (ground) condutors are seperate.
So you guys use TN-C-S every day. incdentally these terms are international, not European, they are IEC I think.
With TN-S the neutral and Protective Earth conductors are seperate from the point of generation or transformation.