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It was necessary to split the bay on the F-35 because there was a single large engine in the rear, and the fuselage was very short.
The J-XS has a long fuselage, and it has two engines. I cannot see the benefit of splitting the weapons bay on the J-XS.
F-22/J-20/J-35 style main weapon bay is located directly beneath S-ducts so the depth is limited.
F-35 style weapon bay can carry bigger munitions