I know for a fact that (front facing) video could be a lot better since I've recorded clearer, sharper video on the S8 and S9 phones in worse lighting.
By default video stabilisation is turned on which is Samsung's EIS, that still creates that juddering look when the frame pans through vertical lines (building edges etc). IMO Sony are the only OEMs that do this just right with EIS, they manage to get it pretty much perfectly smooth. I always turn EIS off and rely on OIS to subtly do its thing. You also gain more FOV as EIS crops in the frame a bit.
The rear camera is better for juddering control but iut's still there you can see it.
Moral of the story, turn off EIS, you get more FOV, and you get no juddering when panning. Unless you're on an Xperia flagship...