Buzzfeed's Tasty channel (which, yeah, is mostly annoying) actually did a really cool segment where one of their guys went to Kyoto, Japan and shadowed this particular chef who's supposed to be one of the best at Omurice in the world. It really showed me the technical skill involved in what appears to be a simple dish.
It's similar to how, if you were to ask a French chef to "test" another chef's skills, they'd probably ask them to make a traditional French omelet. The true French omelet taught to classically-trained chefs in school is actually pretty similar to the Omurice omelet in this video - both in the way they're sort of 'rolled' rather than folded, and in the texture, which should be 'wetter' than an American-style omelet. The eggs also typically have a smaller 'curd' than we're used to in the US. Based on what we're used to, we'd probably describe both Omurice and French omelets as being undercooked.
Anyway here's the video! It's pretty cool to watch this absolute master effortlessly flying through a bunch of Omurice omelets in rapid succession: