It is not petty. It is very misleading. If it wasn't important in creating a narrative, they wouldn't use non-UFC records.
It is also a big issue with the Ali Act. Why is the UFC using non-UFC records, if they are not going to rank non-UFC fighters in their p4p. By using non-UFC records, you are telling me that "professional MMA is professional MMA, and a win outside the UFC is just as good as win inside the UFC." So, if a fighter is coming into the UFC with a 20-0 record, he should be automatically ranked in the UFC.
It is important and it has significant implications. Nothing petty expect for those who are to blind to pay attention to the details of the game. LOL