No need to be passive aggressive. I think what comes to most peoples minds when they think of a doom clone at least includes textured walls. But props to you!
I beg of thee, use that brain of yours and read a text that was made scarcely more than a century ago, a blink of an eye in the grand scale of the changes of the linguistic features of English, and interpret it for yourself.
IIRC, it only officially supports CentOS or some other baroque thing, doesn’t support importing or exporting mp4 when free, and also (unrelated to the product itself) Linux hw accel of video is flakey.
Adding to your point, Seoul is visible from North Korea, and vice-versa, and likely has enough conventional artillery aimed at it that even without nukes an invasion would be Very Bad for the Korean people.