I had some motion sickness playing the game and in my personal case this is caused by not having a crosshair on screen. I really hope they let you put a small dot in the center in the final game because that would help a ton. The game has a somewhat narrow field of view and I wish that was adjustable a bit too as narrow FOV can cause issues, especially if you play the game using a smaller monitor rather than a big TV.
I have experience this issue with other games. Half-Life 2 and Gears of War 5 are notable games that cause motion sickness for me. I think HL2 is somehow too "smooth" feeling. Gears of War 5 I played on PC so it runs at something like 90 fps at least on my system. I noticed that when I used my Samsung CRG9's crosshair feature on it, all my motion sickness problems disappeared completely.
So for this game, adding that tiny crosshair dot that is visible all the time no matter if you have a gun selected or not would most likely fix it for others too. I wish it was a standard accessibility feature, hell even a system option on consoles because it can make all the difference. I will most likely get the game on PC because then it's at least moddable in with say ReShade.