The benefit is rather small if you look at ear training for professional musicians and what properly trained relative pitch looks like. It basically doesn't matter anymore as soon as a professional musician holds his/her instrument. In short: There is basically no difference anymore as soon as the trained musician without perfect pitch gets provided 1 reference tone (which is why perfect pitch gets commonly attributed to people that do not have it).
It is more like a "shortcut" when it comes to ear training, but ultimately a professional musician with perfect pitch and a professional musician without pefect pitch arrive at basically the same destination in practice, making the advantage minimal when it comes to the things a musician actually does.
Rick Beato has a certain kind of obsession with the topic that makes it seem so much more important than it actually is in the real world.
Also noteworthy that there are disadvantages to perfect pitch (transposing instruments, losing it with age, etc.), and interesting video on that topic by Adam Neely [1] was already linked.