I am so *almost* right there with you. I spent about 2 years up until last October working with my multi-monitor setup of 3 different screens with different resolutions and orientations. Sometimes I would even add a 4th 7" screen as a dedicated terminal window. Today I use one monitor on both my office and home setups.
You said, “And it’s large enough to display two apps side-by-side in the rare instances that you truly need to see two things simultaneousl”. This happens to me several times a week, tbqh. Well, perhaps not simultaneously, but I’m going back and forth so quickly I need easy access.
Like you, I also tried the ultra wide screen. Honestly, I loved it. I did find that looking left and right was far more natural than looking up and down. However, like you, I also found window management to be cumbersome on the ultrawide. And it really all comes down to window management, yeah?
But last October I started a new job and decided to try the single screen approach. I was floundering and almost gave up, but then I started playing with virtual desktops. I’m a Linux/Ubuntu user so we’ve had virtual desktops for a few thousand years now. However, this is the first time I’ve absorbed all of the hotkeys to the extent that I can now naturally move between my 4 virtual desktops quickly and easily as well as moving between windows. It’s quick and easy to maximize windows for both full screen and split screen. After working this way for a few months, I love it.
You mentioned having the same experience when you work remote as you do at your desk. I totally agree and am shocked that this makes such a difference. I feel far more product remote now than I ever have before. I never ever thought I would want to give up my multi-monitor setup but I have.