If we 'block the revolving door' won't we have EU institutions which are full of careerists who have never had real-life experience?

Of course, it is important that the EU institutions benefit from a workforce which brings with them experience from many different walks of life. The European institutions should include people who have had experience of working in the public sector, private sector and civil society. But it is also important that the EU institutions are vigilant in preventing conflicts of interest which occur as a result of the revolving door and they need new rules to do this.