Why didn't Ford make a better LS in 2000?

If you bought it used then may not have been cared for by previous owner and now you reap the problems, the trans could have been effected by poor maintenance and hence a repair or replacement on it, the oil changes may have been skipped at times or engine overheated before causing pistons probs and now you had to replace, after enough mileage the coil packs, spark plugs, brakes and battery are wear items and require maintenance replacement eventually, computer may have been bad or was good and replaced as a guess at one time during your other problems, airbag prob I am unsure how to answer about that unless someone was messing with them and damaged, the shut down prob now could be the fuel pump or ignition module, both can be effected by lack of maintenance like fuel filter too old causing fuel pump to work too hard to push fuel thru it and the module could be from tune components not being changed when should and causing the module to work to hard with resistance in the system. Or it all could be the car is crap to begin with...Hope some of what I said helps.