It will impact RCS to some degree, but it also shows a mindset of cutting corners and lack of foresight. For example, the B model is based on the Block 2 standard, when it could have easily been based on the Block 3 spec. The PAF claim they intend to use it in a combat role, but it's already hampered by the lack of the updated IR-based MAWS, the absence of a dedicated LDP hardpoint on the starboard intake, and the lack of AESA radar. Instead, the B model is mostly relegated to training with limited capability in terms of multi-role combat missions. Yes, it could be updated in the future, but that's not likely to occur for at least a decade.