One problem is that you need Firefox because safari doesn’t peppery do ad blocking. But once you have 20 tabs open or so, it uses 5GB GB ram. But perhaps your also need safari for something else. That’s another 5GB of RAM. Then once you count a finder replacement (2GB ram), and some office stuff (probably 1-4GB for each app window), 16GB of ram are almost as sluggish as an old windows laptop. Add MS Teams, and the thing is brought to it’s knees. And Mac OS has a lot of quirks and the window management is atrocious (alt-tab doesn’t switch between app windows, a bunch of apps to get alt-tab behavior don’t work properly either).
I feel like more and more that Mac Users are being forced by the atrocious window management to only have one window open per software, so then the system is fast. Problem is when you have multiple tasks going on in parallel, then you need many windows and desktops.