Thanks for the reply, Frenchy.

My workflow has two reasons :

First, voxelisation and remeshing gives me very clean meshes
with equally distributed triangles, no stretching, no artefacts.

And second, the "Vertex Painting" works great as well as you you can see.
I have no uv maps, instead I paint on the high poly mesh itself.

Granted, I don't build for games etc., just want to get I cleanly built and
textured model without retopo, uvmapping and all that mess.