I'm going to the benches, I was concerned that raising the edge mounted to the floor would throw off the attachment to the wood lip on the wall. Not by a huge amount I don't guess.
I also was concerned with trapping water under flooring from any window or other leak that ran down the wall. When I had the benches out I primed and painted with oil based porch and floor paint
. Seals the wood well, tough, and allows any water that does end up there to evaporate without soaking into the wood rather than get trapped against the wood. I expect there might be condensation from water tank etc. if nothing else.
In retrospect I think I might have been better off to do a bit more sanding and have coated with fiberglass resin rather than paint
but primer allowed me to leave some of the old paint
without sanding entirely to bare wood. Yes I am a bit lazy sometimes, though I prefer to call it time efficient.
All just a theory mind you, not based on having seen flooring trap moisture.