But the thing is is that its not just twice. You'll be fighting dozens, sometimes even hundreds of the same monster to get all the loot you want.
Well, there are only so many monsters/levels. But I feel like the mix of gameplay styles/weapon types make this varied enough. And it is still optional, you don't HAVE to fight the same monster dozens of times if you just want to experience the story content. As far as I know. Unless you want complete sets.
I'm not 'grinding' PUBG because I play the same two maps for 100 hours either.