Outside privacy issues; visiting a website once shouldn't be enough for a website to store as much data as it wants on someone's computer.

Installing a native app is a stronger form of opt-in than simply clicking an URL to a new website.

Chromium (and derivatives such as Edge) allows users to install web apps. You're right that such a facility could be used as a signal for webkit that a particular site's IDB data should be retained for longer than a week.

> install web apps

That's what a PWA is :). Browsers should lift these restrictions for installed PWAs, and probably do.

The browser under discussion in TFA doesn't have PWAs as such. [0] Of course I agree with your restatement of what I said browsers should do upthread. b^)

[0] https://caniuse.com/#search=beforeinstallprompt

Safari still lets you add a web app to the homescreen, though. It could be used as a signal.

Yeah it seems they are encouraging that as a solution. Unless I’m misunderstanding.

“ Web applications added to the home screen are not part of Safari and thus have their own counter of days of use. Their days of use will match actual use of the web application which resets the timer. We do not expect the first-party in such a web application to have its website data deleted.

If your web application does experience website data deletion, please let us know since we would consider it a serious bug. It is not the intention of Intelligent Tracking Prevention to delete website data for first parties in web applications.”

Was that section originally in TFA? It's encouraging, but it certainly contradicts claims that this will only be applied to "3rd party" stuff in iframes...

Native apps don't really have the problem of third-party ad networks storing data intermixed with app data in this way, though.

The regular reports about tracking in random advertising/... SDKs suggest otherwise

Why not though? It seems like third-party SDKs could be included by the developer and stored on my local device.

Every iOS app I ever built for a client had Facebook's SDK and tracking installed, at the client's request. Often Google's and Twitter's too and the user has no awareness of this.

They are much worse.