Trust me, Gary. Tied to an OS that makes the best use of it, a touch screen more than halves the time to do ANY task. Unless you are always setting up Performances for every single song well in advance, unless you have a setup ready to go for every single circumstance you find yourself in, a touch screen is almost a necessity.

Play as a single 100% of the time, with everything set up the way you want it, you barely need a screen of any kind! Get outside of that comfort zone, you have no idea how much time it saves, how it makes doing things to your rig that you wouldn't even consider doing without one not just possible, but enjoyable..!
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An arranger is just a tool. What matters is what you build with it..!