That's on the right track, but going too far. 16:10 or 3:2 is much more reasonable.
The idea of using 16:9 screens for work needs to die in a fire.
That said, working on a web project right now, we _are_ ensuring it looks good when maximised on ultra wide monitors, because we figure people might actually do that. But I'm with you there, for most web content it's ridiculous.
Sat next to it is a 32" 2560x1440 unit (they have near identical pixel pitch, so I don't have to worry about oddities like differential scaling between screens) that most of the time is split into two halves or ⅔+⅓ (under windows, the FancyZones util in PowerToys is handy for this).
I liked the arrangement so much at home that I've replicated it at my own expense in the office.