I am surpised that this sort of alignment system isn't used considering there are several midway outer planes that match up on this chart.
As a bit of random trivia, the first edition AD&D was actually just Lawful, Neutral, and Chaotic.
Maybe they'll change it over time, maybe not, since it's changed in the past. (Looks like 4th edition cut alignment to five categories, 5th edition restored them to nine.)
In Hero Lab and some tweaks to the system, you can actually just assign degrees to Lawful/Neutral/Chaotic and Good/Neutral/Evil.
(So Lawful is 1-2-3, Neutral is 4-5-6, and Chaotic is 7-8-9, for example -- to describe varying degrees of each.)
So a 29 value would be "middle of the road Lawful" and "really Evil".
The only real value to the system today is shorthand to help with roleplaying, and giving quantified identifiers for use with spells (Protection from Evil) or magic items (sword that does extra damage to Good characters) or class restrictions (paladins being LG, Monks needing to be Lawful), etc.