This is why: https://security.googleblog.com/2022/12/memory-safe-languages-in-android-13.html
Yes, it's about languages that aren't Swift, on a platform I don't work on, but the same principles apply. Up until now nothing we've done as an industry has really made a dent in these problems, and we've been trying really hard. Memory-safe systems languages won't solve every problem, but we finally have a weapon in a fight we've been losing horrifically.
(also, huge kudos to my Rust friends, this is an amazing validation of y'all's work!)