I must admit, I'm kind of leaning a bit towards using .WAV's a lot more for my shows...
Then I can run my SMF's through ALL my gear at home for the best sound (including VSTi's, the K2500S and Triton's etc.), and simply take the .WAV to the gig.
About the only thing I would miss is the Mark/Jump capability, and I think I have a workaround for that using the Audio Keys feature, so I can add extra sections to the song if the floor packs late or wants to dance longer than the regular structure...
Even when I'm working with WS's, I usually like to START with an arranger 'capture' as an SMF, primarily to get the drums and any guitar parts down first. I can create those from scratch, but I usually find, if there's a style that works well for the song, getting the drums down with the BK saves me a bunch of time, and I can still edit it afterwards in a DAW to add little change-ups and mess with the fills so they aren't always the same, stuff like that. Then I'll replace out the bassline, and anything else that lacks good voice leading.
But for WS only SMF's, sounds like you haver a great handle on it all, Johnathan. That little BK-9 is a sleeper, isn't it? LOL
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An arranger is just a tool. What matters is what you build with it..!