I don't see that a particular business case is needed. People have long debated what the business case for Bitcoin is, and the jury is not out on that one yet... What is most distinguishing with Decred, is in effect the technical stuff.

Once the comprehensive voting infrastructure is built (beyond voting on PoW), development funding and direction is effectively decentralized. This is unique and truly powerful, especially on a platform that is largely similar to Bitcoin but with a lot of technical improvements to begin with. But since you don't seem to care much about the technical stuff, I don't expect any of this to resonate...

Note: I do believe that a particular business case is sometimes useful and valuable, however I don't think that one is always fundamentally required. If you look at the majority of the popular altcoins (say for example a top50, by what I suppose most people would define as popular, some sort of combination of market cap along with sustained trade volume), you'll find that business cases are largely absent, barring a couple of exceptions.