True, but for many things, the need for "fault finding and repair" is a once-in-a-blue-moon event, such that some people might feel that the slightly increased 'difficulty' should that happen is a price worth paying for what they regard as an aesthetic improvement.You can do that, but why would you? Removing the plug, and connecting to a FCU, makes fault-finding and repair so much more difficult.
Indeed, it's really only 'repair' that's a potential issue since, provided one uses switched FCUs (invariably with a DP switch), 'fault finding' does not really become any more difficult than if one has a plug/socket connection.