While I generally agree with your theory, in practice, I've found that split filtering improves the local contrast (the micro-contrast within a particular tone) of the print. I began using split filter printing when I discovered that my prints with this method "sing" more than they used to. It's a subtle, but real difference. Particularly in the middle gray tones, there is just a little extra luminosity that single-filter printing didn't produce to the same degree.
Originally Posted by FirePhoto