Signal encryption is its main feature (I think) and how easy it makes it (abstracts handling key transfer and all that), I'm just trying to think through... if I wanted nobody to read what I was saying , would I use an app/target as popular as Signal or something homegrown?
We could stack a hundred layers of encryption algorithms, and if just one of them works, then the whole stack is secure.
In the meantime, the added complexity adds new places for errors.