That's absolutely untrue, for a mid- to high-end rig 32 GB of RAM are a must. I have games that use ~10 GB on their own. Add at least 2 GB for Windows and 2 GB for your browser, Discord, game launchers and other crap running and you're already in swap territory.
Just right now just with my browser, launchers, email client, Discord and so on open my system chills at 11 GB RAM usage (out of 32). Yes, if you're running out of RAM Windows will reclaim some of that to make space, but you don't want to go there.
32 GB costs a tiny bit more than 16 GB, it would be stupid to go with 16 nowadays. Hell, in ARMA 3 I already got "System out of memory" errors while playing it nearly 10 years ago with 16 GB RAM.