Disclaimer: My experience with Unreal engine is very limited and close the zero. However, I've worked in the Game dev industry for more than a decade. And have

Disclaimer: My experience with Unreal engine is very limited and close the zero. However, I've worked in the Game dev industry for more than a decade. And have experience in mesh optimisation for various platforms. I don't think the mesh can be directly used in games for any platform. However, the texture capturing with reference geometry is a great asset. With the scanned mesh, there are surface reconstruction algorithm that can use the original mesh as reference and create a mesh close to what a 3d modeller does for gaming. There are still a lot of manual work to optimise and make it ready for tessellation. I am not really sure, if there are any recent innovations in this field to automate this at the level of details needed for a game. If there is, I can only imagine GTA inside a city with this level of details.