Doing 8 might have made it too long. If they were going to leave out two races, those would be the ideal two choices, especially the gnomes.
Now here's the question: if they did include them, what classes would they be? Neither class can be a paladin, so one would have to be a rogue and the other a priest...and gnomes can't be priests. Troll priest in the video?
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Only the exceptions can be exceptional.