Having actually watched the video now, I don't expect this to last.
To explain, as the flight model matures and human ships become the one big thruster with the maneuvering thrusters making handling similar to the old game Asteroids, the Karthu and other craft like it will have a HUGE maneuvering advantage.
The Xi-An will become the ship of the uncoupled dual-stick users who have always done very well in AC. At some point I expect that hard-point to get pulled back to s3 as balance is performed in Beta.
The Karthu may not be easy to master to the point Keyboard and Mouse may not do it justice, but in the hands of a master it's going to be very potent.