50/50 pitch yaw or 45'ing (45 degree turning) was the gold standard for turning all ships before patch 1.2. For whatever reason, 45ing used to negate any drift or eccentric movement when flying any and all ships. It's interesting to see that come back for the 350r in this patch as I haven't really noticed it for any of the other ships, perhaps it's accidental. Either way I wouldn't expect it to persist with the new IFCS.
In the videos, Z-7 uses keyboard and mouse and relative mode (ctrl+c) with look ahead mode on which gives it that less rigid appearance but probably doesn't affect the ships manoeuvrability the way it does to the gimballed mode.