If a team has an imperfect record in their dynasty run then that would be an imperfect run compared to a dynasty that goes undefeated. The team that goes undefeated has a perfect dynasty by virtue of record. It is what it is.
The metric being used en masse is extremely relevant. Using superlatives that only one subscribes to doesn't change reality.
There is no "imperfect dynasty"...we'll be here till 2569 seeing who's "standing on it" last.