Hi zexpress,
While I certainly appreciate your comments, I’d be cautious about anyone taking their impressions of their experience with this (or any other) mattress and then applying them to anyone else’s, and expecting that what they felt is what someone else will feel (“pressure”, “soft” and “firm” are relative and often attributed incorrectly), just as I’d caution anyone to put too much stock into others on the site who have found this same mattress “too firm”, all who have had differing body types. There are simply to many personal variables involved, including levels of sensitivity, to predict how someone will respond to a mattress, or why they might have that particular response (especially after only four days of use).
You may be referring to some products “inflating” over the course of a few days, but foams in general will tend to soften and lose their “false firmness” almost immediately with initial use, with this being most noticeable in the first few months of use.
While I know it can be tempting to do, unless someone has enough experience about mattress design and theory to be able to assess the overall design of a mattress (which would be very few people in the country 
), outside of knowing that it didn’t “work” for you personally, I’d be cautious again about predicting what may or may not be appropriate for someone else. As for low-density foams, that is not the case with this mattress. The 2" polyfoam is 1.8 lb, the memory foam is conservatively rated (to Nest’s credit) at 3.5 lb (most companies would rate this at 4 lb) and the 1.5 polyfoam in the quilt is compressed in the quilt panel, so for most individuals in a BMI or 30 or under these materials would be appropriate. What you may be alluding to is my recommendations for those of a BMI or 30 or above (hotpancakes is 29.5) that I prefer to recommend polyfoam at 2 lb and memory foam at 5 lb (see higher BMI guidelines here).
Phoenix