There are legitimate reasons for needing to disable the wifi portion of a tablet.
At the naval shipyard near here, if you bring a cell phone into the controlled area, the camera must be removed and the hole filled with epoxy for security reasons. There is a local industry of people who preform the service.
There are areas where no cell phones or any type of transmitter is allowed. A tablet may be useful in those areas, but it would be required the radio be permanently disabled.
Can't say if this is the OP's need, but there are legit reasons for doing so.