I was messing around with IX Revival and Ind.Evo, and decided to see if I could use IndEvo's Engineering Hub building to get me some sweet sweet IX blueprints. And for most of the IX fleet, you can definitely do so.
But several of the ships are oddly on the Reverse Engineering Whitelist, and can't be reverse engineered. Ships like the Banteng (IX), Tigershark (IX), the Temblor (IX), and the Flourish (IX). I can understand why the Radiant (IX) isn't allowed to be RE'd (first is it's a former Remnant ship, but it's also quite rare for the IX fleets), but why are the others prevented from being reverse engineered?
It just seems a bit odd when all the other ships the IX has can be, like the Paragon and Hyperion, but these select few are exceptions.