i think it would be stupid to attempt to add agility to a bomber. if sacrifices were to be made then the gains should be in the realm of speed, supersonic cruise would be better if realistic. even with anti stealth radar, to be able to engage a stealth feature bomber at 1000km is pretty hard, so in theory a H-20 just has to be able to quickly get in range, do its thing, then quickly get out before the defender could react.
Why do people think adding the folding vertical stabilisers are about combat manoeuvring? The thing is a bomber, if it needs to dogfight it’s dead already.
If folding vertical stabilisers are indeed a feature, they would have been added for take-off and landings.
The B49 first (US) flying wing bomber design had a lot of flight control issues due to the inherent flight characteristics of the design, much of that was ‘solved’ by FBW control systems, but I would not be surprised if the B2 had significant limitations and restrictions in terms of things like weather conditions and runway length it could safely operate from.
China has always been very obsessive about all its weapons systems being able to operate at the high altitudes of Tibet.
I would not be surprised if the folding tails were needed to meet that operational requirement. It would also have a lot of other benefits like allowing the H20 to take off and land at many more airports and under much more adverse weather conditions.
Given the precision manufacturing capabilities already demonstrated by China, I think it’s not unreasonable to think they can design the folding mechanism to give minimal to no adverse RCS impact compared to a traditional design, at least from radars looking skywards at it. That would mean the only real cost beyond money to such a design would be weight, and not a lot of it. Seems like a good trade-off to me.