Darrian Harmonic Light Cruiser 30,000 tons TL 15

[Endie]

I can completely ignore the Maghiz and give Darrian TL16 warships with CI prototype brains, but we are then no longer in a shared universe as we have completely different interpretations of what it meant to be the common frame of reference.

You're not in a shared universe. You don't run the same universe as a single other person who has ever run Traveller. There are thousands of places where interpretation changes, events change, and of course in even the worst GM's TU, their players have an effect on the world.

So relax, embrace the freedom and stop worrying that people might be Wrong just because they interpret The Holy Canon differently.