Smoothing floors is distinctly a construction job, though, at least that's how I see it. I made HMTB because a comment on Refactored Work Priorities requested it and after contemplating it made sense to me. Yes, they will actually fill the construction frame but never do the actual building if they aren't assigned to construction (so you still have great control over that part).
What is delivering resources if it isn't hauling? So it fits both categories neatly, might as well have both do it at different priorities. I can't think of any jobs that fit the same niche, but I haven't looked at the files since making it.