You literally made up an argument no one made in this thread.
The fact of the matter is that it is unwise to have both secure and insecure messaging side-by-side. Depending on where you live, this could translate to a simple mistake resulting in imprisonment or worse. It's very important that a "secure messaging app" only allow secure messaging.
You, like myself, probably live in an area where accidentally sending a message critical of the government over an insecure message would not have any tangible consequences, so perhaps you're weighing the convenience as more important due to lack of perspective.