DSP modeling of course yields better tracking results which does not require translating guitar pitch to midi.
Fwiw, it's not only about tracking for me. Tracking could possibly still be improved (but in fact, it's not all that bad since some years already), but the main issue would still be that guitar playing techniques simply don't translate well into MIDI commands or possible implementations on the receiving side.
I mean, what's the MIDI equivalent of a slur? Or a rake, a scratch - or whatever noises you feel like creating on a guitar? In MIDI land, pretty much none of those have an exact counterpart. And even less so on the receiving instrument side (because those were built around the MIDI possibilities). Now, sure, modern instruments and libraries have partially extended options for more expressive playing, but you'd still have to send the required playing instructions through the MIDI pipe. As a stupid example, a keyboard player might be able to send a key switch command or a controller message to switch the receiving instrument into, say, "glide" mode (which might be slides, portamento, whatever...), but what are you gonna do to get there with your MIDI-fied guitar? Yeah, you might add a bunch of controller switches and pedals - but that's still entirely different from just performing that slur on your guitar.
And fwiw, because we possibly can't really get rid of most of our typical playing habits, this results in bad tracking perception. But that's not necessarily the case, it's just that there's no ways of translation, so that tonal informations exceeding the MIDI boundaries will sound like horribly tracked garbage.
If you really take care of your playing technique, ideally playing finger style (or hybrid) for chords, also avoiding most articulation manners but plain bends and vibratos, ideally paired with generally excellent technique (no unwanted buzz, great L/R hand synchronisattion, no stupid "unsecure" vibratos and what not), current Guitar-to-MIDI systems are tracking quite well IMO (and already are since quite a while).
But do we really want to do that? Just to still fall way behind keyboardars in terms of proper playing options?
Personally, I don't. I should still slap my GK onto whatever guitar for recording purposes, but that's simply because I'm such a miserable keyboard player, not at all to enhance my guitar sound universe.
After all, one of the reasons for me to play guitar is exactly that it allows for all these kinda things MIDI is completely taking away.
This is precisely why I wish more folks would do things similar (ideally following whatever kinda "standard") as Roland/Boss with their VG/SY series.
