You now see any reference to a moor cast as a person of black African-descent, which isn't particularly accurate. Or Cleopatra, who was ethnically Greek, is inevitably cast as a black woman.
It's worth pointing out that it's a bit silly to try to draw hard lines around this stuff in the first place. Humans don't have races. Paler skin, blonde or ginger hair, hazel, then blue, then green eyes all occurred by mutation in one or a few individuals long before all these 'races' everyone thinks exist. Humans populations have mixed for our entire history- these 'races' are actually culture and language groupings.
So (for example) Morgan Freeman is probably a little dark for your average Moor (a vague term anyway) but it's not ridiculous casting. Gal Gadot is fine as Cleopatra but there is nothing to say she mightn't have darker skin. There is no inherent reason Jesus couldn't have had blue eyes and in art all over the world he's depicted in the image of the people making the art.
I don't like the example in the OP (or the likes of the BBC's Merlin) because it's only a sign of shitty production values and tokenism but better that than we go back to the idea that most roles have to be a particular ethnicity.
Where colour-blind casting is really important is in the vast majority of roles where skin colour is irrelevant to the character.