Errr none of the Terra C builds come stock with carbon bars- carbon frame and fork yes, bars and seatpost, no.
You can always get a fork with bosses. The new aluminium, steel, and titanium terras all have forks with bosses. I, personally, don't need fork bosses.
You can go on about how the Terra C isn't a bikepacking bike. Except it is, because really, whenever someone asks " What is a good bikepacking bike?", the first answer is: "The one you own".
I've used my Terra C for several multi-day off-road, sometimes remote trips. I've carried camping gear, cooking gear, food, spare clothes, etc- all of which you've said is impossible while bikepacking and/or riding this particular bike. In fact, last week, two of us were on Terra Cs, successfully bikepacking/camping. Our biggest issue with the Terra C we would have with any bike: our height. We're both 5'2" and ride 46cm bikes, so packing takes a bit more planning and focus (though I think I'm there with my set-up now).
Later this summer, I look forward to bikepacking with my son, who will be around 19 months old at the time, on my Terra C, while pulling him and his trailer along. We'll be camping, though any off-road won't be any more technical than a canal towpath. But that's not a reflection on the bike and it's capabilities, more that I don't think my son would enjoy flying down a steep, technical descent being thrown all over the place.