The move should make life more difficult for aggressive advertisers and attackers alike. It should prevent sites from using login fingerprinting or even the state of your anti-tracking prevention to watch your behavior. It should also thwart cross-site request forgery attacks, and prevents the use of auxiliary third-party domains to identify users.

The updated Safari also limits storage for a website’s scripts to one week, and includes counters to sites that try to avoid tracking detection by delaying their redirects.

Apple won’t be alone in the future. Google aims to achieve the same for Chrome by 2022, as an example. The WebKit team also plans to report the results of this change to the World Wide Web Consortium to give other browser developers some assistance. And yes, you can frequently enable this kind of tracking after the fact. It’s still a milestone, though, and could easily force ad creators and site operators to rethink attempts to collect tracking data.

There are other substantial improvements. You can finally share iCloud Drive folders (this was announced at WWDC last year), complete with real-time file updates. You can buy iOS and Mac apps in bundles. Third-party navigation apps now work with the CarPlay Dashboard if you’d prefer not to use Apple Maps. Mail has an updated button layout to prevent you from accidentally deleting messages. The TV app now has data saving features to save bandwidth and storage. And yes, there are new Memoji stickers in case you need to add a personal touch to your eyerolls or celebrations.

There are corresponding updates for Apple TV, Mac and Apple Watch users, although the Apple Watch update may be the highlight. It now allows in-app purchases for watch apps, and introduces both ECG support as well as irregular heart rhythm alerts in Chile, New Zealand and Turkey.

There’s no mention of CarKey and other hinted-at iOS 13.4 features, but some of those may depend on partners and hardware announcements, assuming Apple doesn’t wait until a later release. Even so, there’s plenty of substance here to justify an upgrade.