Depends on the industry and use-case. Some line-of-business apps might be designed without caring about any mobile/responsive usage. Others might be meant to be

Depends on the industry and use-case. Some line-of-business apps might be designed without caring about any mobile/responsive usage. Others might be meant to be used at a specific workstation that has a computer as part of it (for example, the app might be controlling some equipment), or in some other environment in which mobile usage makes no sense.