This is an interesting subject. Bees in the brood box will make lots of brace comb/walkways if the bee space is too much. The bees will repair the comb and trim it back if you remove the brace comb and if you put the frames back in at the correct spacing. However, in the honey box…the bees will happily make much deeper cells without the brace comb. You can put in frames a little wider each year and they will fill with honey…hence the depth of the Flow frames.
I use my hive tool to scrape the edges of the Hoffman spacers too…it ensures a good fit especially if your bees like to use a lot of propolis!