> Outside of some of the bundling features
Bundling (in the inbox) is THE reason for using Inbox. It's the only unique feature. It's the thing that changed how I use email.
If I use folders it's the kiss of death for any email that a rule sends to that folder. I want a single list but with some items collapsed.
Email went from unthreaded to threaded (reducing the complexity massively.
Bundles takes that one step further.
In both cases the critical thing is one ordered list but with a massively reduced number of individual items.