Ladybird seems to be progressing at an impressive pace also, time will tell however if their choice of C++ will be a big problem or if modern ways of doing things are safe enough.
Time will tell if that will be a big problem or if more mainstream ways of doing things are better for a project intended to run everywhere!
That is not their goal at all, I don't where you heard that. Swift is currently stalled due to some blockers listed on their issue tracker, but any usage of it will be in safety-critical areas first and not a complete rewrite of existing code.
While the C++ interop in Swift seems sane with Clang being embedded I wonder how much time/energy they will have to actually move significant parts if it's so large already.
https://ladybird.org/#:~:text=The%20choice%20of%20language%2...