Stair stepping is a mark of someone that either is too lazy to do it right or too inexperienced to know better. 2x8 floor boards? Really? That's unusual. If they're 2x8 floor joists w/3/4 ply I would think 1/2 ply instead of the OSB would be better. If they're really 2x8 floor boards I'd still prefer plywood, as it will tie them together and produce a less flexible floor. The reason people use OSB is because it is cheap. I don't think the Aquabar matters too much if it is between the sheathing and the subfloor, but I'm someone here is more knowledgeable about that.
There is no rule or standard against stair stepping. Just may look funky depending on how busy the flooring is ie lots of shorts etc. The 2x8 is very common and can breathe with the aquabar over it. OSB to me is borderline unless it is new and not weathered.
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