It's the only way. You wouldn't last five minutes otherwise.
I'm really enjoying the game itself, but I'm on the third boss and got bored with him almost immediately. A really carp cycle of attacks that kill you instantly if you don't use magic and run around in a circle at the perimeter. They even have a row of little temples around said perimeter, to shield you from his ground "blasts", so it's planned that way! BORING!
It's irritating because you have to beat him to open up the crafting, and he's taken nearly 6 hours to get to...
It was free on the PSN and well worth some time, but if I don't beat him tonight, I fear Horizon Zero Dawn will see him back in the drawer for a long, long time!