Thank you for your reply. All I'm interested in is if it will run properly. Is running Vulkan a performance thing or a visual quality thing?
It is both. Directx 11 is from times where multi core processors were not a thing. Vulkan (and directx12 which this game does not support) are created to support 8-core CPUs and such much better.
Then again directx 11 is created so long time ago that graphics quality and "tricks" have moved forward also. Vulkand (and directx 12) support many more visual things than directx 11.
Your nvidia card 3070 and nvidia (newest always of course) drivers support vulkan very well. I have 3 different nvidia generations cards 1660ti, 1080ti and 3080 and they all run vulkan without any issues.