Poke around online on any of the popular car repair channels and you will find some of these Nissan GDI 5.6's sludged to death. Obviously they could have been neglected, but you will not find this type of failure with the previous port injected Nissan 5.6.
It's the same scenario with the VQ35DE vs the GDI VQ35DD. You will literally find 100's of failed DD reports on various Nissan forums. Nissan of course keeps the situation quiet. I owned a 2019 Pathfinder with the VQ35DD. Being a Nissan fan in general, I've been following this stuff for years.
Where I am going with this is, I would not go more than 5K miles or 1yr between OCIs on an Armada or Titan. I personally would be more in the 4000-4500 mile range. Nissan doesn't offer much in terms of individual parts for these engines and what is available is outrageously expensive.