When I first heard about that "Enterprise-D finds the Botany Bay" story I did what most folks undoubtedly did, thought about that
story. But then I started to realize that story has a flip side. The absence
of the Botany Bay from the twenty-third century.
Think about it, no Khan means no "Wrath of Khan"". No dead Spock, no "Search for Spock". No exile, no "Voyage Home". (We'd have seen three very different movies.)
I wonder where the Enterprise would have been when the Whale Probe struck.