In my entirely anecdotal experience, MacOS is significantly better at RAM management than Windows. But it's still a $1,600 USD computer, and 16GB of RAM costs nearly nothing, it's just classic Apple greed.
The main metric has been with Adobe apps. 2017 Macs with 8GB of RAM are still able to run Premiere and a few others things smoothly simultaneously. Windows machines with the same config were crashing constantly and kept going.
But I'm still not defending Apple here. It's been 6 years, and their base level MacBook still ships with the same amount of RAM.
It’s not anecdotal in the least. It’s been widely tested. There’s a reason an M1 Mac mini with 8GB of RAM can load and fully support over 100 tracks in Logic Pro. The previous Intel machines would buckle with just a few.
ARM is not comparable to x86-64. The former is totally unified, the latter totally modular.