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"Leave it there and come back when i got more time" = Bookmarks :)Let me reiterate the first part of that sentence you've quoted: "I doubt many people set out to work that way, it's more a symptom of the "I'll leave that there and come back to it when I get more time" mindset."
> If it is a dynamic website, most of them have sessions that expire.
That depends entirely on how long the session cookies are set for, whether the user browses to other pages on that site since (thus potentially renewing their session cookie) and whether one even needs to have an active session to use that specific dynamic website. Suffice to say there's more exceptions your point than there are examples of it. eg message boards, youtube (and other similar video streaming services), imgur (and similar), etc. And even in instances where the session only manages access to that page, it's not a great chore to log in again.
To be honest I don't really understand why you're trying to lecture HN readers about sensible browsing habits. We're all tech-savvy enough to know how to use a browser. If we chose to adopt a workflow that's less CPU / system memory performant then we do so fully understanding the problems that might arise. The problem is many of us - myself included - grew up in an era when websites were a document rather than an pseudo-desktop application so often our ranting stems from a frustration at how bloated the web has become.