Signal isn't meant to be a mainstream one-size-fits-all, even tptacek admits as much:
https://news.ycombinator.com/item?id=22371316
He actually seemed annoyed that everyone insisted on using it for everything :-)
If you need bulletproof cryptographically verifiable encryption - use Signal.
If one wants to plan dinner, use whatever fits your bill.
(And if in addition to the same supposedly bulletproof encryption as Signal you also want NSA^HGoogle to back up your messages and Facebook to know who you talk to and when so they might better customize their ads^H^H^H your experience you can also use WhatsApp :-)