That is why people who propose allowing parallel systems are really trying to save a system where the gatekeepers are the insurance companies. Don't think they don't know it either. They are selling a system that cannot work in order to kill Medicare for All.
That's why I have no tolerance for these corrupt shills. They know the realities but are hoping the public doesn't. The media is also a willing co-conspirator in pushing this as a better and more popular option.