Christian_Deimel The fix will likely be in before majority of the standard release tenants get the feature. On the concerns you listed:
- With the introduction of coauthoring, users are no longer exclusively checking out a page by default. This means that in your scenario of a user unintentionally doing it, that will no longer be the case. Another user will be able to hit "Edit" and edit the page. This is one of the key benefits of coauthoring!
- If you edit a page and make changes to web part properties, then a new version would be created. Those changes wouldn't be visible to viewers unless published which works same as today. The change is that if you want to discard the changes you made, you will need to go to Version History to do it. This aligns our experience to what you see in the rest of Microsoft Office like Word that also don't provide a discard last change and instead leverage version history to enable users to be able to do delete the last version. If you don't mind me asking, can you provide more details on why you would choose to copy the page instead of leveraging version history?
Microsoft