This enhancement is done for easy reference. Whenever you edit any task, all the edits will be logged under the activity section in the edit task page.
To view the enhancement:
Navigate to Contact 360 of a contact
Click on Task section
Click to add task
Once the task is added, mark it as done.
Once marked done, click on 3 icon tab and click on edit.
Make edits as required.
Once the edits are done, you will find all the changes made are mentioned in the activity log below.