Your more than likely correct.Nissan seems to be highly regarded elsewhere than the US. At least in countries where Japanese vehicles are the most popular.
I don't think Nissan would still be in the US market if it wasn't for the subprime lending / leasing they did. I have to imagine , fleet sales aside, the US market is more expensive to them than other markets.
We have specific US models that aren't sold in other markets. I'm sure platform sharing helps some to bring the costs down but I imagine the US market isn't their cheapest to sell in.
They have been attempting to fix this. The Rogue, Versa and Sentra are global platforms. The Armada has been since 2016 (shared with the Patrol platform).
The Frontier is nice, but I wonder if splitting it from the Navara was worth the cost?
Ghosn wasted a ton of money on building capacity for 7M units a year which they never got close to. Focus is everything. They lost it a while ago.