Ultrawide angle lenses are practical and fun. Almost every landscape, architectural, wedding or event photographer has one, as do many filmmakers. I have one, too. The problem with most of them, though, is barrel distortion. Usually, the wider the lens, the more of it you get.
You can fix Barrel distortion in Lightroom, but it’s easier if you don’t have to deal with it at all. The new Laowa 12mm f/2.8 Zero-D from Venus Optics uses 16 elements in 10 groups to eliminate barrel distortion almost entirely.