Absolutely, John. If you don't use these techniques much, why WOULD you need this..?

But for all of those with well developed piano soloing styles (solos aren't necessarily just ONE note at a time, or confined to the upper section of the piano - watch a GOOD pianist sometime, and see if he dips into your LH area), or refined bender techniques, or two handed syncopated funky techniques, or those that like to play VERY outside chords over steady rhythm section play (montuño, anyone?), or a myriad of other, legitimate non-arranger keyboard techniques, you MIGHT need this to perform, or be FORCED to use SMFs.

If you are a simple LH chord RH solo player, and especially if you learned on arrangers, and your entire ability is based around this style, of course, this is of no use whatsoever. But there ARE players that do have a different approach and ability, and any tool that allows them to express themselves with these methods is OK in my book!