Seen from the other side of the fence, some of this appears to me to be a false dilemma. T5 uses examples from the 1105 era to explain how some things are done, because most Traveller players are familiar with 1105.
Let me be more clear.
The T5 rules books should contain examples of how the rules are used and those examples should be from both the Classic Era and other settings/milieus.
Examples the Classic Era should be included for familiarity and other reasons. Examples from other settings should be included to hammer home the fact that other settings/ milieus are supported and that the rules are not 1105 specific.
Putting it another way:
The T5 core rules books should contain NO PURELY SETTING OR MILIEU FOCUSED MATERIALS.
Examples of rule use for various settings and milieus? Yes. Material in the rules that is purely setting and milieu focused? No.
Settings and milieus should be introduced in their own books or booklets so that T5 can avoid the mistake that hampered Traveller from LBB:4 Mercenary on through TNE.
Read James Maliszewski's "Grognardia" blog. Nearly every time Traveller is discussed someone comments that the OTU eventually metastasized until it overshadowed the rules. Snarling the official setting and rules together was a mistake that T5 should not repeat.
Wide scope, 1105 examples.
"Wide scope, 1105 and at least one non-1105 example" would be much better.
But that doesn't mean we need only have Classic 1105 Milieu examples. I'd like to see a small Ziru Sirka warship. Hmmmm...
Exactly.
I'll be fading back into the woodwork now...