Like how easy it would be for the aliens to find it. How it would have been impossible to defend. How it would have contributed little because - surprise - making and fielding top-secret cutting-edge experimental aircraft is harder than sourcing some extra hangars and maintenance technicians.
No, sorry, I am not answering this with a wall of text again. I wrote why this exaggerated\wrong during the actual discussion many times.
Also, what you fail to understand:
It is normal for a designs to have some flaws. Every freaking time when I offer anything with intended flaws they are a)exaggerated naming the design unusable, b)rejected immediately because designs must be perfect, or c)plain ignored
Flaws by design give GM what to base design on. Flaws by design are there to reduce difficulty and\or give benefits instead.
Design A:
This fighter is very fast IS NOT better than design B: This fighter is very fast but has limited payload.
Excuse me Mr. South American council member, could we park some ravens at one of your airbases?
VERY HARD DIFFICULTY
To be fair there are also: We'll try to improve your deference for free (with technologies we already have) and setup pilot academy (I mean sometimes make our pilot to train together). Oh, and we'll dig a hole under one one of your hangars to place some of our technicians away from sight. I think it makes it Ludicrous
Sure, we can't know what difficulty was unless 10ebbor10 tells us (and he won't because it is a direct hint we can use in the future) but we can assume.
BTW, yes. Roseheart's base that started small was better than Happery's. Maybe it was the best of the three.