Thanks to everyone for passionately advocating for the Conversation History card in the side bar! We sincerely apologize for the early removal of this feature and have now enabled it again.
We understand that the Conversation History card has valuable information that our Timeline is currently still missing. We will work on improving the Timeline and will keep the Conversation History card until that is done.
We are happy about more feedback around why you are using the Conversation History card, so we can make sure to explore all use cases for the Timeline!