I've now tried 2 other products but this one put a smile on my face and made me happy since it qualifies all my general criteria - 5 stars from me on all 4 from me!
I've used this extension since version 4.4.x and it keeps getting better.
Re-installing (with the latest release) of course makes editing possible again.
Isn't it suppose to revert back to the default editor?
Which editor is set as the default is not controlled by JCE but is an option set either in the Joomla! Configuration or in the Joomla! USer Manager. If the editor has been uninstalled, it cannot influence the default editor setting. What you are highlighting here may be a bug in Joomla!, not an issue with JCE.
Big thanks to the developer of this plug-in.