Mostly saving money. Digital Signage is what you want if you want a "dumb" display, but they don't have TV tuner (which may or may not be an issue) and also are rated for 24/7 use and thus much more expensive than consumer level TV's at the same size. They usually have minimal image processing and very low input lag as well.

If you don't mind dropping the money then go for it, but I think most people will want to go for consumer model for much less.

Also I am not sure if those support HDR or other features that may be desirable in a consumer display.