I vector aircraft around thunderstorms for the approaches all the time, but occasionally a pilot will surprise me and want to do the approach with level 4 or higher weather on the final.
Most of the time all the pilot has to do is hold for ten to fifteen minutes for the storm to move off the airport. Often there is also a major wind shift with the storms passage so we end up changing approaches.
But I agree, something needs to be done to prevent the Bold Pilot Want to Be from pushing the envelope.
Mike