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Android will soon instantly log you in to your apps on new devices
(arstechnica.com)
This is a most excellent place for technology news and articles.
A lot of pages aren't designed for PWAs or mobile use whatsoever. For example, my 401k provider actually hides the login form when viewing from a mobile browser, so I have to switch it to desktop mode to get into it. They have an app, and it probably works w/o Google Play Services (haven't tried, but there are no notifications), but the mobile app is pretty limited. Likewise for my HSA app, the website is more helpful than the mobile app is.
On my old phone, the web browser runs regular pages poorly, much less video, and it's not even that slow of a phone (Android 11, 8 cores, 4GB RAM). So I totally understand older phones having issues. My current phone is a Pixel 8, so it's plenty fast.