I think people tend to just not be as careful with their words as they should be. It is a fact that the contrast on a Kaleido 3 screen is worse than the contrast on a Carta 1200 screen. Is a Kaleido 3 screen still usable? Of course it is. Are some people willing to sacrifice contrast in order to get colour? Of course they are, or Kaleido panels wouldn't still be manufactured.
Do some people prefer contrast over colour? Of course. Different people have different eyes. The people who are in that camp are concerned that Kobo hasn't released a Libra BW to replace the Libra 2, and some of them come off as condescending, but I don't think anyone who's acting in good faith would begrudge somebody for being happy with the Libra Colour.
Those of us who care about contrast are just worried that Kobo is going to forget about us if the Clara/Libra Colour sell well, and the Clara BW doesn't. We don't want "good enough" contrast. We want the best contrast possible to minimise our eye strain.
