I have a 5K, 34" ultra-wide LG (https://taoofmac.com/space/blog/2021/08/21/1600) and a somewhat-4K-like tall 28" LG (https://taoofmac.com/space/blog/2023/05/31/0845) in front of me most of the day, alternating with a 15" Surface HIDPI plus a 14" 4K external monitor for calls on my standing desk.
On the Mac, apps open on the same displays and locations most of the time. Granted that Stage Manager is a cluster...flow of confusion, but I actually appreciate the way I can get sets of windows "back" in the same positions when I switch tasks.
Full screen games work the same way on both platforms (three if you count my Ideapad Flex, which runs Fedora and is occasionally plugged into one of those monitors)
Side docks are... well, an affectation, really, but let's call it _deeply ingrained personal choice_. As a former NeXT user and long-term WindowMaker refugee, I liked them until I realised that hiding the dock and having it back on-demand did wonders for my sanity (esp. regarding notifications). So now the docks stay off-screen, at the bottom (like GNOME).
The menu bar... Is the last bastion of nice, usable UX in a world of Electron. So I like having it everywhere (although it is always dimmed in inactive displays screen), because Fitts' Law ensures I have something I can hit with my mouse in a hurry.
Having windows on the "wrong" display is... highly dependent on the type of window and where your focus is, but largely consistent (system alerts always show up in the right display, etc.)
The ergonomics of multiple displays are a highly personal thing, but in my "left-tall, centre-wide" setup (where bezels are all The right-hand side of my desk is where I keep the "distracting" stuff like my phone, mug, pencils, electronics parts, etc., and that's comfortable for me. But it's not a Mac-specific issue.
So yeah, there are a lot of first-world considerations in this piece, but I wouldn't consider it representative of any real issues.