If you ever plan to do any screensharing for fun, support, or any purpose. It's all terrible. I screenshare with people daily and those with ultrawide are unusable. Most switched off for this reason alone.
Movies and productive they are just fine. But I'm not a fan but know lots of people who love. I'm just a regular 3 27" monitor person.
Only time I'd consider ultrawide for gaming is for sim games. Racing or flying but I don't play those games enough to justify.
The only thing I do miss is 'zen mode' when reading online articles. Going full screen and removing all task/menu bars doesn't always work if the website left aligns everything, but it's really not a show stopper.
I pair this with my tiling window manager[1] which treats ultrawides as a first class citizen (not all twms do this unfortunately) and I'm very happy with this setup.
"Works for Me".