This is where I am now. 32” at native 4K, 1@ resolution, but with text size bumped up a bit on some windows. Internal monitor is the slack/mail/calendar display, work is on the big one. Even when I’m using the mini, with no internal, I don’t find that I miss having two monitors.

The few times I’ve used a 49 ultrawide, meh, I’m not impressed but it’s better than just the internal. I’d probably need to reset the window manager to do 1x4, rather than using thirds.