I think in general, modern fantasy authors need to grapple with the fact that a lot of myths and folklore about monsters were informed by human experiences with nature, and that they originated in a time when nature was a lot more dangerous to us than it is now. Today, we have the capacity to be a lot more harmful to nature than vice-versa. This should mean that the swamp dragons that were a menace to us a thousand years ago are dying as we destroy their habitats. The snow spirits that would snack on us if we got caught in their hunting grounds are dying as the world grows hotter.
If you just move all of these nature-inspired figures into the modern world without accounting for the ways we've been injuring nature, you kinda end up with an implicitly anti-nature narrative. Now, I think you can write narratives where certain monsters become more dangerous because our actions have made them so - it would be appropriate for storm and fire monsters to get a boost, for example. But at the same time? You'd also need to acknowledge that they've become this way because of our actions, and it's still on us to take responsibility for what we've done.