I'm a retired Cadillac tech.
The NorthStar had many problems it shouldn't have had , not enough testing time?
After you work on many of them , they do get easier , but nearly impossible to beat flat rate times,
especially when you have to wait on parts orders. The starter was an exception , easy to beat FR
It was near impossible to find anyone qualified or willing to work on them.
This new engine may make that more difficult.
Imagine taking your car in for a repair , the tech tears it down , then quits and leaves the pile for someone else
and they can't hire someone else to put it together.
Happened a couple times , 2 months for head gaket repairs.
Nice piece of enginering , but totally unnecessary for a daily driver.