Hi bghouse,
Some of the better options or possibilities I’m aware of in the Seattle area are listed in post #2 here (just in case you haven’t seen it yet).
I think you understand the “why” very well … and I agree with you that mainstream mattresses aren’t as durable today as they were 10 or 15 years ago before the era of one sided mattresses and thick pillowtops that use lower quality materials and soften and break down much more quickly.
Here’s a suggested ad …
For Sale: one mattress that is too soft for me and probably uses lower quality materials in the comfort layers which may break down fairly quickly … but is made by Stearns & Foster which many people continue to believe is higher quality because of the name on the label. I hope you are one of them. PLEASE don’t read ANYTHING at The Mattress Underground before buying this because I need the money to buy a better mattress.
Phoenix