So, that was one anecdote for that specific person.
I open pages in the background for various reasons, one of them being a live read list (especially when I gather information). More often than not, the gathering become nested (which in turn opens new pages) and when I'm done, all tabs are closed.
If the pages remain inactive for a while, the'll become unloaded/suspended.
I think that the entity to blame, is the authors of said pages that make it impossible to bookmark for later consumption. That's the sad thing with www of today. Unpredictable and unreliable. Free pages that become paywall after certain amount of minutes/views, generated pages that changes information, broken bookmarking and so on
