All vessels have limits on the sea state they can handle, particularly small vessels. Very large vessels can generally handle much more. You can see how much more the traditional small patrol vessel is bouncing out there, my spine hurts just watching. I could see this being used for pilot vessels and harbor patrol craft, for sure.
According to another comment, the Candela can handle waves of up to 1.2 meters. But about half of waves in the open ocean are 2+ meters. So this boat can't handle a normal ocean sea.
Yes. The east coast of Sweden is the Baltic Sea, which is not an open ocean. This boat may be perfectly usable there. But that's still not a rough sea. Other than temperature, that is water that I'd be perfectly comfortable swimming in.