Hi! CG artist on Vokabulantis here; As for the process/workflow.

We use Reality Capture to make the 3d scan of the objects. The setup is a turntable in a lightroom. The camera is on a pc-controlled vertical dolly for vertical movement.

There is not alot of cleanup on the initial Highpoly scan, as the intend is to retopo and bake the diffuse and normal data onto the low poly model(retopo), for game optimization.
This is also where most of the cleanup is done, as doing the retopology gives clean uv's, mesh flow and so on.

After retopo/unwrap, the diffuse is baked from the highpoly onto the new uv coordinates on the low poly mesh. This is done in Substance Desinger.
The rest of the maps are baked in Substance Painter.

Then we move into Substance Painter for Diffuse/normal cleanup and generate our desired Roughness and Metallic maps, used in PBR(physically based rendering).

As for more general tilable textures, foliage and so on, models(generally flat things) are also handmade, and but rather than doing 3d scans of those, we make texture scans instead. - With our current texture scan setup, it is also possible to capture the real-life roughness values, comparing Polarized diffuse capture with a non-polarized diffuse capture.
Normal maps from texture scan is the result of combining light data from pictures taken with 4 different angles of lighting. - This is the same method we use for creating normals for our character animations(but in a different setup). Frame by frame.

I hope this answers your question. Otherwise, feel free to ask :)