Did you just change the smart email editor?
The previous smart email editor window and its tiny panes were not ideal... but at least it was easy to copy paste... and to see the rules...
Now, more clicks are needed. Not an improvement for me. Harder to tell what I am doing. Much harder for other colleagues to understand what is happening with smart email content if they want to edit something
IMHO what the smart editor needs is much bigger windows... all it needed was the ability to resize!