That removes way less than all of the abrasive dust, and to some extent just turns what remains in to an abrasive slurry. You still get abrasion of the coatin

That removes way less than all of the abrasive dust, and to some extent just turns what remains in to an abrasive slurry. You still get abrasion of the coating over time. And water doesn't help at all with damage due to solvents, glue, and the like.