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I'm not sure why you would have to use the drops. Adding or removing 14mm of spacers or stack should be easy.
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.
Mr_B-
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.
Zdrenka
I'm not sure why you would have to use the drops. Adding or removing 14mm of spacers or stack should be easy. A lower CG will always be better as long as you can pedal freely.
An EBB will rarely end up in the front of rear of the shell since there is a very low amount of change in the overall chainstay length there. There is a much bigger change in CS length at the top an bottom an so it will more often than not place itself there. Should it end up at the end of the shell a half link will correct it and you'll be able to go a tooth up or down on the cog without upsetting the geometry significantly.
Rockers or sliding dropouts is good if you want absolutely static geometry but it will limit your frame material to steel in most cases unless you go custom.