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The last time I upgraded a laptop's RAM after purchase was 6 years ago, and that was because I *expected* to do that when I bought it. Had it not been possible I would've bought it with twice the RAM from the get go. And I'll take battery life over that any day.
I actually don't remember ever upgrading the RAM on a laptop I or anyone in my family has owned other than that time. What I *have* done is buy used laptops with little RAM and upgrade it though, but always at the start of my ownership.
Usually by the time more RAM makes sense, a new machine makes sense anyway. There are exceptions, but it's not the norm. Machines get reused for other purposes, for which their existing RAM is fine. Nobody is throwing away laptops because they need more RAM.
Besides, if you're on any kind of decent usage cycle (>5 years) by the time you might want more RAM we're probably a generation ahead and obsolete RAM is no longer cost effective.
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