@fahrni Let me be blunt.
It would be foolish and irresponsible to re-write the C++ codebase of Safari, particularly WebKit, in Swift. We're talking about millions of lines of code here.
There is little, if anything, to gain from such a venture and so much to lose. Doing so would also almost certainly stall or significantly slow development.
This is a bad idea.
So, your first instinct to admonish developers to not rewrite their software is the good one.