What does Yahoo do? Microsoft has Windows, Office and Xbox. Amazon has massive web server and product distribution platforms. Apple has OS X and iPhone. Google has Android, search, ads, and an online office suite. What does Yahoo do? I guess they have some long-time email users and a well-liked stock tracking platform?
My Dad used to spend time on Yahoo!'s portal too, mostly for stocks and movie information. I never thought it was worth going directly to Yahoo, but if a Google search sent me there for a stock then I'd read it.
The original "synergy" idea was more about being a portal. But those don't exist anymore because search completely superceded it. It seems too late for Yahoo! to revive its search business. It isn't a good aggregator or content discovery platform because there are stronger competitors like Reddit, Twitter, and Facebook.