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This is the diagnostic produced for similar example using new diagnostic architecture:

error: binary operator '+' cannot be applied to operands of type 'String' and 'Int'

_ = "a" + 1

   ~~~ ^ ~

note: overloads for '+' exist with these partially matching parameter lists: (Int, Int), (String, String)

_ = "a" + 1

       ^

note: candidate expects value of type 'String' for parameter #2

    @inlinable public static func + (lhs: String, rhs: String) -> String
                                  ^

note: candidate expects value of type 'Int' for parameter #1

    public static func + (lhs: Int, rhs: Int) -> Int
                       ^

Yes, SwiftUI diagnostics in particular are going to benefit from these changes.

Yes, exactly since it allows for fewer context switches and cache locality not only for the network packets but for disk I/O as well.

It uses Thread-Per-Core architecture where Netty/Reactor use thread-pools to process work and have dedicated threads for selecting from network.