My original post was about the art of acting and referred to Samuel Jackson's pejorative remark about the casting of Daniel Kaaluya. I guess you're talking about something else. So you're right, I can't talk about American racial issues. So I wasn't.

That's not what I said. Read my post again. If you want to be deliberately obtuse, go practise on a mirrror.

In theory, yes. Any actor should be able to play any role. Then it becomes degrees of how successful the portrayal is. However, obviously the visual aspect is important in practical terms, if the plot point depends on the race of the character. But generally, I'm all for colour blind casting.
Perhaps colour blind…

As Olivier once said to Dustin Hoffman, who had just returned from distance running in order to feel authentically sweaty and breathy, "My dear boy, why don't you just act?"