This is not true. 1) When devtools are opened in chrome - caches are disabled by default 2) Even when requesting to server - chrome show it as request 3) Manife

This is not true. 1) When devtools are opened in chrome - caches are disabled by default 2) Even when requesting to server - chrome show it as request 3) Manifests works like a charm. You can open app completely offline. For example, you can check telegram web app (our project disabled this feature during development). 4) Manifests easily handle updates of web apps - just re-requesting manifest once 20 min +