What happened to the Historical Records in All Activities?
This very useful Hints area very often led to finding new names on potential sources of your ancestors in the Tree. I work in a Family History Center, and often have shared this tool with patrons. Regardless of whether they had few connected people in the Tree or many people already there, these hints almost always lead to discovering new family members (spouses, parents, and children) who were missing from the tree.
Losing this feature is a very big lost. Out of the last 15 people I have showed this feature to, 13 found new family members on the very first hint they looked into.