Aviation News – Germany and France have agreed to abandon a flagship project to develop a next-generation European fighter jet after failing to overcome longstanding industrial disputes between the companies involved. The decision marks a significant setback for one of Europe’s most ambitious defence initiatives and raises new questions about future military cooperation on the continent.
The US currently has four different fighter jets or similar in service and China has nine looking at Wikipedia. So no not really a problem, if they are different enough planes, as designed for different tasks. It currently looks like they will be with France building a small, light carrier capable jet and Germany a larger, long range, heavy, fast ground based one.