It's got NOTHING to do with an arranger. Chalk and cheese. Only people trying to SELL you a MoXF are calling it an arranger/WS hybrid...

Weird thing is that hammer action 76. I don't get that. Sure, great for piano, but lousy for organ, flutes, synths, basically a LOT of sounds better played from lighter actions. I just don't see why, if you want fully weighted, you wouldn't go 88. There's not even much of a weight saving.
76 plastic offers a MUCH wider selection of things you can do well, as long as it isn't TOO light weight.