My biggest fear as a "solo" player was singing and playing acoustically with little or no backing. I've worked somewhat on that, and although my voice still "is what it is" ( bluesy and never really quite "pretty enough" for some ballads / love songs ), I think I've slowly been able to turn what I had always thought of as a weakness into something that seems to work pretty well for me when I play live. I like playing this way for a good portion of a show, and the added bonus is that everyone can tell it's all "me" when I turn the accompaniment off.. for better or worse, and fortunately it seems to be better most of the time.
In line with using modern equipment, as it evolves it allows us to more closely emulate instruments such as guitars, saxes, etc ( Articulation Voices, megavoices, "Guitar Modes", Multisampled modules / Vst's, and sample sets ). The other area I've tried to work on is recognition of what the emulated instrument actually "does", and then adjusting my playing to best utilize technology available .. for example using the articulation pedal at the right times or working on better velocity control on multisampled voices, or perhaps on guitar sounds rolling my wrists a bit back and forth to produce a more realistic strumming effect.
AJ
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AJ