> If you want offline mode, you worry about IndexedDB

I don't understand the offline mode. If I was to make a single player offline game that runs on the browser, sure, offline mode makes sense and I want to store on client machine.

But in the space of web apps, everything data needs to be synced with server db.

Why would I want to store half of my to do list on client and other half on the server? The end goal is the customer data is stored in the cloud...