Hi Vjay,
You are still getting some partly true and partly untrue or misleading information.
This isn’t correct and there is certainly such a thing as certified organic latex and also organic latex mattresses. There is more about organic mattresses and materials in post #2 here and the posts it links to.
This is partly correct and partly incorrect. Keeping your spine and joints in neutral alignment is an important part of a mattress that is a suitable “match” for someone but is also about much more than just having a new mattress that doesn’t sag in the middle. Different body types and sleeping positions and different types of people may need or prefer very different mattresses (see mattress firmness/comfort levels in post #2 here). There is also no such thing as a specific type of mattress that is “good for backs” in general although there are certainly mattresses that can help individual people. A mattress that is the best “match” for one person in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) which means it would provide the best possible alignment for their back in all their sleeping positions may be very different from the mattress that is best for someone else’s back.
Mattress warranties only cover defects in materials and have little to nothing to do with the useful life or a mattress. There are also mattresses that have a 25 year warranty that may only have a useful life of months or a couple of years for some people (see post #174 here). There is also much more information about the many variables that can affect durability and the useful life of a mattress relative to each person in post #4 here and the posts it links to as well.
If a back problem is the result of a medical condition then it’s certainly true that a mattress won’t solve it but a suitable mattress can certainly make a big difference compared to sleeping on a mattress that isn’t a good “match” for any particular person. Good salespeople will know how to help their customers choose the most suitable mattress based on careful and objective testing and/or accurate and meaningful information rather than “theory” or “hype” or “marketing stories”.
You can see some comments about Cantoni in this topic and the better options and possibilities I’m aware of in the San Diego area are listed in post #2 here.
Phoenix