Earlier quoted context omitted.
If yours are all over 7 years old you really have no idea what a modern Mac can do with 8-16GB of ram…
8GB of RAM. Not 16GB. And oh yes, the modern Mac shares those 8GB with the video RAM...
The Unified Memory Architecture is why these Macs are so fast—no wasted cycles moving data between RAM and GPU. And the data is compressed in real-time so less data has to be transferred and there's less ware and tear on the SSD, which is directly to SoC [1].