I considered it, but after putting together the first level, I couldn't think of why it would be much of an improvement. With 1 shelf on it, it easily supported me standing on it with no bowing or flexing in the shelves and no slipping on the posts.
I used the 1/2 drill bit for holes, so there is no gap for it to help cover on mine (anyone using the slightly larger bit will want to reconsider your idea for themselves, tho!)
I also was concerned that washers may make adjusting heights more difficult once assembled and trying to keep the price down a bit for myself.
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