Auto-decoding

[bauss via Digitalmars-d-learn]

I understand what it is and how it works, but I don't understand 
anything of how it solves any problems?

Could someone give an example of when auto-decoding actually is 
useful in contrast to not using it?

Just trying to get an understanding of what exactly its purpose 
is.

I did read 
https://jackstouffer.com/blog/d_auto_decoding_and_you.html

But I still feel like there's not a clear explanation of what 
issues exist when you don't have it.

If I need to be more clear, just let me know.