Actually there is nothing crude about FM or LA synthesis compared to
wavetable synthesis. A wavetable is simply doing the same thing an
oscillator does (or an operator in the case of FM synthesis), it's
just doing it in a pre-determined way instead of requiring computing
power to create the waveform. It could be thought of as being much
more versatile than a pure sample player/ROMpler that contains a fixed
set of samples, but it suffers the same fate because on every
wavetable synth I'm aware of, there is a fixed number of waveforms.
The primary "real world" benefit to wavetable synthesis would be that
complex waveforms can be generated more efficiently on any given
processor (for games that would be the CPU or DSP of the synthesizer
or sound card as opposed to the PC... for music producers its the
synthesizer itself or the CPU of their PC if using virtual
instruments). The "on paper" benefit is more "natural" sounding
sounds, although this is incredibly misleading, because it makes the
assumption that reproducing the harmonic profile of some sound will
necessarily result in a more convincing sound, and anyone who works
with synths of all of the various types knows that the net result of
wavetable synths is no more convincing than any other type of
synthesis. That's not to say wavetable synths don't sound good, many
of them do, but it's not necessarily because it's a wavetable synth. A
wavetable can be thought of as a "cheat sheet" for a harmonic profile,
but the harmonics of a sound are only one factor of many that makes
one sound differ from another.
A good example is a saxophone, this is notoriously hard to synthesize,
and the only convincing renditions I've ever played have been samples.
You can get something that sounds "enough" like a saxophone out of a
synthesizer to be suitable for a video game (wavetable, FM,
subtractive, LA.. whatever), but it's never going to fool someone into
thinking someone was playing the sax. A ROMpler / sample player can
do this easily (well, not easily as sampling is a difficult art in
itself).
Synth purists would probably say that additive synthesis is the most
capable of producing natural sounds, because of the flexibility it
provides in producing a given set of harmonics. However, additive
synthesizers have never sold well, and in the entire history of modern
music, I've never heard an artist mention an additive synth as their
goto instrument of choice, nor have I ever seen one on stage. I'm not
even aware of anyone making an additive hardware synth board. Why?
Because the theory that we can Google or look up in wikipedia is often
at odds with real world results. Additive synthesis is a very
interesting technology, but it is incredibly difficult to program
well, and the end result always seems to be underwhelming.
Wavetable synthesis certain has it's place, and does some things well,
but it is no more sophisticated than any other synthesis method.