Technically we don't know for certain F-47 will not have vertical stabilizers yet.
I did find this F/A-XX concept art floating around the internet a while ago. As we know, Boeing has lots of concept art for the F/A-XX programme which logically could carry over to their NGAD proposals as well. There's also the possibility they'll merge NGAD and F/A-XX to save costs, which means we'll see one fighter design (or at most an F-35 style variant-split) for America's 6th-gen lineup.

The underbelly intakes are reminiscent of the original J-20 concept outlined in Dr Song's paper. Funny how similar it may be to the F-47... an aircraft unveiled nearly 3 decades later.
I, for one, welcome the J-20's (possible) new lease of life as a "6th-gen minus" fighter. Poetic justice for all accusations it has suffered these past years.
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