Indeed it is! Gunpla, as well as just about all other scale models, often require broad areas to be covered in a single color, a task airbrushes can accomplish easily and quickly.
In addition, the thin coats left by an airbrush allow for pre- and post-shading and gradients.
Furthermore, because...
( ,°-°)\ Farewell, Airbrush-kun.
You there, in the comments, do you too use an airbrush? What models? How do you like them?
I got a Grex Tritium TG not too long ago. It's been great getting back to a gravity-feed and I personally love the pistol-grip.
rads identified HDM as "Hakushon Daimaō" (The Genie Family), and the translator also got the obvious DRM = "Doraemon”, and from my own knowledge KRG is clearly "Keroro Gunsou" (Sgt. Frog) and one can easily guess OBQ and HTK to be "Obake no Q-tarō" (Little Ghost Q-taro) and "Ninja Hattori-kun,"...