No one ever said the XS is a perfect arranger.
And it is incorrect to say that styles would be equivalent to Patterns and sections on the XS.
You do not have to go in the pattern mode on the XS to play styles.

And remember all an arranger is a loop station customized for live band like playing.

If you could have played an arranger professionally 15 years ago you can do it on a XS with no problem and have much better sounds doing it.
This is not just theory but from actual experience playing a lounge gig in arranger/performance mode on the xs.