There may be problems i.e. bugs in the eps and svg backends, as I often try (sometimes unsuccessfully) to edit these in inkscape and/or CorelDraw and sometimes, but not always, get 'badly formed eps file' messages from Corel, or spurious lines appearing in svg files in inkscape and Corel, for example. Do others get this too?
When saving in a vector format, is it possible to remove objects totally outside the bounding box from the output files in some smart way? I guess this is currently left up to the individual backends to decide on, but perhaps implementing some filtering functions for the backends to use would encourage their use and help make output files smaller.