It will appear as if you don't know what you are saying or you are making things up. Also, you will have people saying this:
"If you can't explain it simply, you don't understand it well enough."
Nobody's going to wait for you to finish your sentences either. They assume something and react.
Such reductionist statements might be valid for most cases but if you are at the receiving end due to communication/articulation problems, it's really difficult to convince people.
There are other problems that come up.
It takes me a lot more iterations to get things right. I'm curious if someone has figured out communication for people with language disorders.