It's the Achilles Heel of audio/loops!
TBH, I have no idea why these longer loops have ANY pickups or fills in them. That's not how it's done. Or wasn't, until now. That's what fills are for!
If you want to be clever, have a touch sensitive system where a light tap gives you a pickup, and a harder one gives you a fill... Now that's something I could USE!
But a machine that tells you 'You BETTER have a song with four-square sections, or I'm going to play as if it were, no matter what!' is not a machine that YOU control.
Audio loop arranger makers... ENOUGH WITH THE PICKUPS IN THE MAIN LOOP!
I want to put them where I want them!
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An arranger is just a tool. What matters is what you build with it..!