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Oh, I get it now. :) But as I said its not particularly hard to utilize the full amount of BB drop.
Its not that rockers and sliding dropouts aren't possible on Alu and carbon. There is just very few framebuilders that utilize it because it adds cost, complications and a little weight, and if you choose to ride with gears its redundant.
An EBB is an add-on. You buy it seperately. The owner chooses to ride SS and its out of the hands of the framebuilders. Much easier for everyone.
I meant using the drop-range of the EBB shell, not handlebar drops :)
I didn't realise Rocker/sliding dropouts weren't possible on Alu/CF framesets.