IMHO, such purpose built virtual guitar instruments are a premium product and not likely to be bundled with any DAW, as the necessary bundle price would push it beyond the cost anyone would be willing to pay for a DAW. This allows a keyboardist to sound a bit more like a guitar player. I have several 3rd party virtual guitars and they all offer much more than pure sample playback for realism, such as keyswitches and modulations, to easily trigger different guitar articulations from within a single preset. Although with a bit of effort, one could make that work. Going back to the OP, I will submit the distinction that the connotation of 'virtual guitar' speaks to a more elaborate instrument than just a sampler with guitar samples. But with the integrated sampler in Live, one could import any guitar samples they wish. True, which is also the case with Ableton Live, although the guitar samples they include with their instrument rack and sampler are probably more suitable for electronic music. My guess is most DAWs have a sample-based synth with guitar samples.
