Earlier quoted context omitted.
While yes, that would have been a better title in terms of telling us what the post was about, but then you get a different tone for the post. I think the post is first and foremost for thanking Arash for his work on Dropbox and about the partnership he had with Drew, and telling us about it comes second.
I don't disagree with you but at this moment in time it just seems a bit prudent to add something like this at the top: "Arash – our co-founder and great friend – is leaving Dropbox for new adventures." Just one simple sentence like that at the top lets us know the rest of the post isn't a eulogy, or at least not the kind where someone passed away. Any other point in time when there isn't a global pandemic you can le…
And Arash is well known at Dropbox (and also here.)