As a new owner, perhaps you were lucky enough to have never experienced having a superior user interface removed from your vehicle and replaced with one that suffers from significant usability problems.
It's tough to go through, and this isn't a $200 phone... it's a significant expense. It's also not a small subjective change, but a fairly large overhaul that is objectively worse.
In some cases, these changes absolutely make certain situations less safe. Since it's safety related, reporting to the NHTSA isn't totally off-base.