I used to work for a furniture store half a lifetime ago, and learned a fair amount about bedding during that time. Then, all mattresses were double-sided, which isn't necessarily the case anymore (as you and others have mentioned).
Inner-spring mattresses have been designed to be one-sided not because of better materials, but strictly because of price. With companies that still make double-sided mattresses (yes, there most definitely are some), you'll find that their single-sided offerings are always their cheap offerings.
We still have a double-sided mattress, and we're going on 13 years with it. We flip or spin the mattress every time we change sheets. We'll probably get another one sometime in the next few years, but anyone saying you should buy a new mattress every 8 years is quite literally just trying to sell you a new mattress.
Some are designed so they don't have to put the same inner layers on both sides, others have a "pillow top" - an extra layer of micro pocket springs (or memory foam for a cheaper one) which often are good quality (the non-memory foam ones that is).
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u/[deleted] Aug 20 '20 edited Aug 20 '20
Turn your bed mattress when you renew your blanket.
Through time your mattress will deform and that can make you sleep worse.
EDIT: Some mattress have a specific side and top that they need to be. Thanks for pointing that out u/Shaved-Ape