The appendix is a gut microbiome zoo it has a function just not a core one.I think alignment is nonsense so I chose 5e because it makes it optional and pretty much ignores it.
The alignment system is the coccyx of D&D. It maybe served a purpose when people were still trying to wrap their heads around "it's like a war game but you pretend to be the characters," but our understanding of role playing has evolved since then.
Edit: I started out using the analogy of the "appendix" but then remembered that D&D actually has one.