Dungeons & Dragons 5th Edition - Now your playing with Playtests!

[Scots Dragon]

I tend to see it as more of a societal trend than anything else. Many bugbears are at once rebellious and malevolent, so 'chaotic evil' fits, for instance, but you'll almost always find exceptions. I don't really think that anything should be fully bound by its alignment even given outer planes types, but the system is useful to have, especially given its thematic importance to Planescape.