[masklinn]

The problem is that Webkit nightlies are absolutely not evidence of what the future version of Safari will contain, webkit is the engine but features are added and removed before it becomes Safari.

That the STP bears the "Safari" name and will be updated through MAS[0] and is featured on their developer site and has access to all the cloud features and shit from standard Safari is a much, much stronger signal as to what future version of Safari will contain.

It looks very much like an apple-official dev channel (chrome) or developer edition (firefox) for Safari, TFA even claims an update frequency about halfway between the Chrome Dev Channel (0.5/1 week) and the Firefox Developer Edition (6 weeks)

[0] despite not even being installed through MAS