Why do iOS devices become obsolete far faster than a Mac? Because they're completely non upgradable (and the Intel CPUs that Apple put in Macs is usually far more powerful than it needs to be,
iOS devices become obsolete because of advances in processing power per watt for the SOC.
Slots, or sockets won't fit and wouldn't change that anyway.
Macs become obsolete just as fast, just some people think pushing crappy old hardware way beyond its reasonable life expectancy and out of warranty coverage is somehow worth it, when they're probably far better off buying slightly lower spec and selling up after 2-3 years to some sucker with similar thoughts and staying up to date with improved bus speeds, memory speeds and CPU feature sets and power efficiency.
As an example, my 4 year old "upgradable" Macbook Pro has a now garbage discrete GPU, USB2, SATA 3, thunderbolt 1, single mic., old bluetooth standard, no HDMI, crappy battery life, really bad cooling and a non-retina screen.
Memory slots fix none of those problems.
I could waste money upgrading it and running the gauntlet with system board failure, or i could just buy something newer with a warranty. So i did. If i needed the money, i'd sell it off.
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