I suppose the key thing is that it's optional. The biggest pitfall would be to create something which has so many options, it's impossible to find the "classic" sound(s) that you expect, e.g., a Les Paul to produce. As long as the core tone is all present and correct, you have a simple, usable option, without being forced to explore the additional bells and whistles...but if they can't get that right, then they're really in trouble!