Dealing with stammering is like walking up a staircase.
Each step up is positive progress. However, with any staircase you need to keep climbing up if you want to reach the top.
There’s no sense in stopping half way!
The same is with stammering.
Extra vigilance needs to be taken with stammering. Stopping half way can create a false sense of security. Yes, confidence has grown at this point. But stopping here can quickly result in you in falling down the stairs. You end up starting from scratch.