The sole purpose of manual flying is to develop and maintain the skill needed to do so when automation fails and nothing more. There should be no sense of adventurism. Commercial flights are not training flights. Passengers pay to go from A to B as safely as possible. The very purpose of the flight is to make money for the company and not to get some thrill out doing something extraordinary. If you create an incidence/accident while trying to be a better pilot try telling that to the passengers. How many sectors you should hand fly. The answer is as minimum as required to keep the skill. Anyone who needs to manually fly 4 sectors everyday should have been doing something else. Another thing Airbus FBW has been aroung and growing for last 21 years and is here to stay. If you are not comfortable with the machine you should change your job. any new aeroplane you fly you need to adapt to it and not otherway round. I have flown both As and Bs and enjoyed both. Uneasiness about a machine is in the mind.