Also, "need" is a poor measure. Very little we consider fundamental in rich, developed countries is about "need". Take indoor plumbing, running hot water and flushing toilets - do we really need those? There are people alive today that grew up without those (in rich countries), and they did fine.
Yes, a good mattress is a bit of a luxury, but you're spending a third of your life on it, so it's hardly frivolous to invest in good, comfortable one.
Perhaps I've been corrupted by the mattress salesman talking points, but it seems sensible to optimise spending money by the time spent doing certain activities.
For me that means that spending on a comfortable work area - desk, chair, monitors, keyboards - comes first. Then maybe sleeping areas. I have avoided upgrading the bedroom only because of the confusion of understanding what is good value for money so far, as there are no returns or free trials of mattresses here.
In comparison, most people way overspend on their cars, which they might use only one hour per day.
My son can sleep soundly on concrete.
I'm tall, wide-shouldered, heavy-ish. So I should sleep on my back. But then my arms fall asleep. So for side-sleeping, I need at least a spring mattress.
I've had a few memory foam mattresses. They wear out (get divots) when the tiny air pockets get compressed and don't reinflate. So roughly, foam density is the key, denser is better.
Ignore any review that doesn't explicitly mention density. Shipping weight is a good proxy. Heavier beds, like the Tempur-Pedics, higher density, should be more expensive (cuz more material).
Light-weight people will probably be happy with the cheapo (under $1000) memory foam from Costco or Amazon.
I now recommend a good quality, flippable, plain (no pillow top) spring mattress and a disposable memory foam topper (3" to 5", depending). Best bang for buck, life span. I've done this a few times and it's as good (for me) as a full memory foam mattress and doesn't divot so fast. So my next bed will probably come from IKEA and whatever topper Costco's selling that week.
I haven't tried latex foam, so can't comment.
Ideally, I'd have a cocoon chair, or adjustable hospital bed, where I'm partially upright with arm rests.
Sure all the technology stuff is fake- we call that marketing. Do you need the latest in shoe technology to walk down the street? You do not. But people buy Nikes nevertheless.
What Americans, and other Western cultures, have a problem with is an obsession with consumptionism - the belief that you can always buy a solution for everything, the belief that the best solution comes from those who advertise most, the belief that they even care about you solving your problem. The gullibility to buy "space-tech" widgets with "new QuantumPower formula" that is obvious bullshit, from people who obviously have zero incentive to help you, and all the incentives to take your money.
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[0] - I mean, what else is there? Magic? Hoping for divine intervention? Pretending a problem doesn't exist?
It is a whole market fuelled by fear.
Ya think that when 1/3rd of your time is spent (or roughly should be spent) on a mattress the quality should matter??? Not to mention back problems from not sleeping correctly or on the right position.
So, yeah USA is 200% correct in debating mattresses, just as HN crowd would be about debating about chairs, tables and keyboards.
Science moves on, so maybe "cotton-filled mattresses" aren't the best anymore. Personally I can attest that homemade sheep wool mattresses clump together, I can't see cotton do any better. $1000 is NOTHING to get a better nights sleep, Americans spend a lot of money for fancy coffees, just to start