I would be very surprised though if the people who actually implement the control systems (as in doing the hard math) don't use radians, though. Is that really not the case? Using degrees just seems like unnecessary extra steps when dealing with transfer functions...
Internally yes they probably convert but it is not exposed anywhere, kind of like Chemical reaction you convert everything to Mols internally to do the calculations but externally you report all of the inputs as a mass.
The control system won't tell the operator to add an extra 0.3 mols of reactant or to tilt the furnace by Pi/4 radians
