For my 2c worth it's simply a matter of what looks best aesthetically- unless you're trying to match an image from the Hubble, in which case take onboard all of the scientific knowledge available and lay your colour cards on the table!
I'm an unashamed "pretty picture" maker, if an image looks better to my taste with saturated or Rgb stars then so be it! Personally I have no love of magenta stars, they just don't work in any way to my perception- but as to whether or not a star is the 'right' colour, well I'll leave that to the experts to decide, meanwhile I'll just keep on attempting to make them look good, not distract from the image and celebrate their richness of colour!
Many of us are making 'technical art', but what comes first is the real debate, Technical or Art?
Good discussion, look forward to continuing it with you over a decent glass of red one day
