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PS: please don’t make analogies to car engines. That serves no purpose. Computer systems and combustion engine vehicles are different. Let’s just stick to common computer knowledge.

Maybe, But that is the best way I could have explained on Storage vs RAM.
 
Maybe, But that is the best way I could have explained on Storage vs RAM.

Your repair guy got you off track. There's no concern with number of apps and RAM. The OS performs memory management functions and offloads unused apps so it's not something that you have to think about.

Old devices get slow because future OS versions are tuned for newer hardware, so eventually you fall behind.
 
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But I thought slowing down of device has got to do with RAM on that particular device and not storage actually isn’t it ? Storage is just physical storage of that APP where as it is RAM that plays a role in how much space is used by the APP and ultimately resulting in smooth runnning of the Device. So why do you say Storage? Isn’t storage like how many passengers can fit in a car, but RAM is like the Engine of the Car which determines how smooth and efficient you drive is gonna be ?

RAM is used by actively-running apps and processes - it's a form of fast storage directly connected to the CPU to feed that data/code quickly to the CPU. Code/data is moved from slower storage to RAM when the CPU has need for it. It is removed from RAM when it has gone unused for a while and something that is currently needed requires that space.

If an app is doing nothing, then it's no different than a document or image file - it's just sitting in "slow" storage, waiting for the next time it may be needed and is fetched back to RAM.

You can certainly have situations where RAM does become over-taxed - all it takes is one app and a very heavy workload. Again, it's not a matter of how many apps you have, but what those apps are doing. If they're doing little or nothing, then RAM is not negatively affected.
 
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