I don't think the Motif is intended to be used as an conventional playback arranger at all. The Arps are great for a jumping of point in a new song but intros and ending will have tp be recorded the old fashion way. Part by part. I view the Arps as Multi-pads so far. Salt and pepper but not the meat and potatoes....I hope they are more than that.

I like the arranger "type" features but I certainly don't want another arranger. I want a DAW integrated Work Station.
I love the AI of the Yamaha fills...but using a keyboard live that would be a terrible omission if it were not so. (The PA2x was sloppier in that regard if I remember correctly)

Although the lines are somewhat blurred with the XS and an Arrangers one can still see the sharp edges. Years ago in Cakewalk version one there was no linear sequencing (although you could have constructed a LONG Sone) It was all pattern based which is loop oriented. Thehn chained together into a song.

What I like about looping 8 bar patterns is trying out different parts on the fly until I find something I like for that A section or B section. I don't see where the T3 is as intuitive in that regard,since one cannot create patterns then chain them into a song...( I guess one can use the Registration banks to save patterns then press the buttons while recording a sequence in linear fashion......nah..the work flow is terrible.)