The standard edit mode has three core buttons:
- Publish Changes
- Show Preview
- Show Changes
The third button is missing in the new tool. The button brings up a standard DIFF which shows what changes will be made, and it does so in a familiar, formal, and extremely precise format. My last conflict was a bit more complicated than average, I did resolve it correctly, but during the process I wasn't 100% sure I had solved the edit conflict cleanly. I was painfully hesitant to save without being able to verify it via the ShowChanges diff. (It happened to be a talk page edit conflict, and there is heightened feeling of responsibility not to screw up other people's comments.)