To be fair, they had to crown another champion because they booked themselves in a corner because they had Roman beat Brock to win both belts. It wasn't so much because Roman was champ so long, but because they already established he was unbeatable. They need to have two top titles to keep both TV partners happy, so here we are.
Also he's been champ since 2020, and there was something else going on in the world at that time that played a part in him holding the belt that long.