They only take good tracks and make them better, not crappy or mediocre tracks.
I beg to differ. I can randomly place vertices on the grid on NL with as little skill as possible and then using the tracksmoother all the points are adjusted to make a near perfect track. True that it would take skill in designing a unique and original track, but it simply takes the skill out of all the trackwork. Sure you coukd finetune all the points on a track so they were near perfect, then use the tracksmoother, but in all honesty the difference is pretty much insignificant imo.
But still i do agree with you last point 'Why make anything harder than it has to be?'