But who is better-qualified? Being an expert in the field is not, in fact, part of an MP's job description, nor a minister - unless it is a legal position where having legal qualifications is essential.
In some instances, expertise has brought disaster: we've had a number of Chancellors who were economists by trade/training and with the exception of Roy Jenkins, they've all been disasters.
Ted Heath's appointment of a former Director of the CBI as Sec of State for Trade and Industry ended in disaster (John Davies ended up as an excellent shadow foreign secretary instead; he didn't get the job in 1979 because he retired from politics in 1978 after being diagnosed with a brain tumour which killed him in the following summer).
Being well-qualified on paper doesn't always translate to good execution of the job, particularly in politics...