alt Hacker NewsRight, I mean even a fast SSD has an order of magnitude less throughput, and 2-3 orders of magnitude higher latency from RAM. No dispute there. If you are doing random access across 16GB of data and your machine only has 8GB of physical RAM, you're in the pain zone.
OTOH, if you are using multiple RAM-heavy apps that aren't actively hammering that RAM (e.g. an instance of Photoshop that is using 10GB but is just idling or whatever) then MacOS and their stupid fast SSDs handle that pretty seamlessly.
Most use cases are probably somewhere in the middle.
Browser use on the modern web is enough to put you in swap territory early and often on 8GB of RAM. My much more RAM efficient M2 iPad Pro with the non-desktop OS and 8GB of RAM frequently has to page out apps I had open two minutes ago if I’m doing anything with the web and like one or two other applications. This things eventual replacement in like 4 or 5 years is going to need twice or thrice the RAM for me to consider it an upgrade.