It's absolutely clean enough. Stop arguing!! :-)

If you want a worn bench that people will view from a distance - it is perfect.

I may be wrong, but I think when he says messy he means too many polygons, and the more polygons used the more resources it takes to render. So even at a distance it would affect performance if the poly count was too high.

It's not just about the polly count. Messy models have irregular geometry, holes, intersections, floating faces, incomprehensible and wasteful UV layouts, unwelded edges and the mesh is denser where there is more noise instead of being denser where more detail is needed. They are a nightmare to repair as well.