And not all of the changes were good ones. Seems like administrative editing of a service via the REST admin URL has been disabled, didn't see that listed in the new changes? How to reproduce:
Go to
https://services1.arcgis.com/some org code/ArcGIS/rest/admin/services/YOUR_SERVICE/FeatureServer/0/updateDefinition?token=SOME TOKEN
Double-quote the edit date
Change something about the schema:
...and then observe how nothing was changed: