Dennis, I know you can do this with the arps, but it STILL doesn't do what arranger fills do. You can ask for a fill at ANY TIME. And it will play in sync. You don't have to write special fills for particular beats, and even more importantly, if you ask for a fill a fraction later or earlier than you programmed, you don't end up with a train wreck. Who HASN'T called a fill in a fraction late or early? Well, actually, many of us don't even realize that we HAVE screwed up, because the arranger engine handles everything automatically, with nary a hiccup. MoXS arps are FAR less forgiving.

However, I did not realize you can make loops 'one shot' for Endings. That's good to know.

But if the MoXS added the 'auto fill' system from arrangers (defeatable like it is on most arrangers, too), song arrangement navigation would be much less timing critical than it is now... and the MoXS WOULD be the modern alternative to the arranger that is hasn't yet become, IMO.
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An arranger is just a tool. What matters is what you build with it..!