So your complaint is essentially "Safari doesn't default enable a bunch of experimental features and doesn't blindly adopt whatever half-assed features Google pushes".

Looking at the CanIUse stats for the features you complained about made me wonder if your whole post is meant to be sarcastic.

- the contacts api spec is draft, and can be enabled as an experimental feature in Safari 17

- the file system access api is a Google-sponsored draft and not "fully supported" by any browser; Safari and chrome both support the same thing on mobile: "Origin private file system".

- the background sync api is yet another Google-sponsored unofficial draft.