While I enjoy the deeper characterisation of things like goblin tribes, and having elements that let us see their 'real-person' culture and practices, etc., it's still a valid point that we very much need elements that CAN just be an evil to fight, without shades of grey. Shades of grey is fun and compelling ,when that's what you're looking for, and it does make a lot of PnP campaigns a lot more nuanced and interesting... but in a video game format, where combat will be the largest of the three pillars, the need for a simple evil that *doesn't* raise questions of moral quandary is still essential. It's a difficult balance at times.