

By specifying first person shooters, they are ignoring all the dual analog games that started coming out in 1996.
People forget the first Playstation dual analog controller:

But primarily used in shooters for space sims like Colony Wars or mech combat like Iron Soldier, which aren’t first person shooters.
Pre-dating this was Sega’s Virtual-On arcade machine in 1995:












Depends on the landslide, sometimes they clear it and re-build, in this case the land next to it was more stable.