Yeah, although I don't think a boxing match is especially realistic...it's still very controlled and sanitized (thanks to having things like "rules"). But yeah, the editing tried to make things more dynamic, but all that did was show off the lethargy of the fights themselves.
I think what sports like boxing, wrestling, MMA, illustrate really well is that not every blow or move is gonna be dramatic, is gonna be pretty, is gonna be effective, etc. while at the same time showing how resilient the human body can be to trauma (though as we learn more about the human body and brain, we're quickly learning the long term severity of cumulative trauma). Even though it's much more controlled environment, it's still very real and very serious, even if its not always pretty.
That's true enough, but in terms of an "out there" fight, it's still very different.