Helldritch
Hero
Why do you want to put numbers where none are needed? 5ed is subjective all the way through. How often do you give inspiration and which method do you use? That rule is entirely subjective and even more hurtful than alignment as some BITF are more prone to produce inspiration than others. We went for the cinematic advantage as it encourages players to think outside the box.You said "Basically, you look at a personality and each alignment is a box. The biggest box is your alignment. The rest are the aspects that fall outside of your alignment. If they're mostly the same size, you're neutral."
That's not an explanation of how it works. That's just a tired excuse. For instance "if they're mostly the same size, you're neutral." But how close is "mostly the same size"? 55/45? 60/40? If someone is 70% lawful and 30& chaotic, what does that make them? What if they're 40% chaotic, 25% neutral and 35% chaotic? And how do you, personally, measure how lawful or chaotic something is? If something seems random to everyone or nearly everyone, but actually follows a huge, elaborate plan, is that lawful or chaotic? Is Chaos, of the type involving butterflies and hurricanes, actually chaos or law?
And how is labeling a creature "neutral evil" going to tell you how it reacts in any particular situation? And do all neutral evil creatures react in the same way to that situation? If not, then how is that label useful, or more useful than actually giving it a few sentences of motivation?
And this is not the only subjective rule in 5ed. There are many others. And guess what? We can ignore any that we want and modify any that we want. You see no use for alignment? Fine. Is it because it can't be quantified? If this is the reason, then I advise you to bring back alignment in your game and use qunatifiers if this is what you need.
Personnaly, I prefer the alignments as they are. Fangless but useful guidelines. Nothing less, but certainly nothing more.