I personally didn't feel that the 1/8th would make that much difference. It didn't.
Compared to?? - Just kidding

The frames, as you've seen, don't go all the way to the bottom of the box. So that 1/8th meant nothing to me.
It does change the bee space, but like everything else in beekeeping, there are multiple opinions on beespace. But decreasing it by the 1/8" is probably the safest of the changes. Making it larger would allow for brace comb, and the 1/8" reduction doesn't make it small enough for them to want to propolize it.
I have had some equipment that had all beespace on top and others that have the more standard way of splitting it between top and bottom.
I tend to agree with Beth on this, it is not that big of a deal, unless you want by the book perfection.