> Offline-first apps sound like the future: ...no more spinning loaders on flaky connections.

Even offline-friendly apps get spinning loaders on flaky connections. Google Docs will be stuck checking to see if a doc has been updated before it loads it, and will only actually open it when I turn on Airplane Mode. Similarly, Spotify will be stuck loading a saved playlist or album because it's trying to load extra information it loads when connected to the internet, and again only Airplane Mode will skip that so it knows it's offline-only.

Flaky connections are the bane of existence of apps that work offline, either because apps want to load extra online-only data whenever possible, or simply ensure everything is synced before taking a big action.