Really, 2008?
http://www.everymac.com/systems/app...-2.0-aluminum-13-late-2008-unibody-specs.html Seems they came with 4GB, max upgradable to 8GB?
Also RAM has changed considerably in the last 10 years. 16GB of ram in 2010 is nowhere near equivalent to 16GB of RAM in 2017. You're just looking at one physical metric and judging the entirety from it. Like suggesting your 2008 machine had a 500GB hard drive and so is the same as a 2017 with a 500GB hard drive.
Essentially, with the bus speed increases and cache improvements on modern CPUs, coupled with faster RAM and significantly faster SSDs (In turn with faster bus rates), and modern OS optimisation of memory implementation. The physical capacity of RAM is not the limitation it was 10 years ago. RAM is just something for apps to store temporary data whilst the CPU works through it, if that data can get calculated at a faster rate, then it is contained within the RAM for less time. RAM is fast becoming obsolete as a necessity in computing, and is a lot more complicated than just the capacity of it. Certain processes will always require more RAM, those in which the memory is actively taken up (VMs for example). But for most processes, it's better to quickly crunch data through RAM and store variables within the swap space.