It really depends on whether the tone is generated or if it simply prerecorded and played back, essentially the difference being whether it's a synthesizer or a sampler or even worse a ROMpler.

Nothing's wrong with being able to save your patches, it was a great technological leap forward. So if the company's going to have all these slots for patches to be saved in, why not fill them up back in the factory to help market/sell the synth? Basically, just to show a quick example of its broad range of uses, and beginners to sound design have a palette to use straight out of the box, and hopefully they'll become disatisfied with those sounds and want to tweak them to their own taste.

Now if you're trying to imitate violins and other real instruments, you're better off with a sampler. Why twiddle with a wave for hours just to have it sound like a not-violin when you could record a violin and play that back? Of course, sampling real instruments is very limiting depending on the number of samples you have to work with and your saviness with envelope generators and other subtle controller changes that one can use to make a sampled sound come alive.