Digital BW, The Print

Steve Kale wrote:
>...   If you are using Channel Mixer to convert to B&W
> and want to be able to retrace your steps then saving this step as a layer
> will, I believe, require you to keep the document in RGB.  This isn't such a
> big deal except for the extra size etc.  If you are not worried about
> keeping this layer then I would flatten and then go to GG 2.2 greyscale.
> You can then easily save the document then bounce to Adobe RGB (which has a
> gamma of 2.2) for your Photokit output sharpen and then print - discarding
> the output sharpened file once it has printed.
> 
> 
What is the advantage of converting to GG2.2 if you're workflow requires 
you to convert back to RGB? The same applies when using Paul Roark's 
curves for example. Retaining the original colour file and being able to 
alter the channel mixer settings etc right up until print time surely 
outweighs any advantage in converting?

Howard