Is there a "TYPICAL" arranger player? ... maybe, ... I don't know ...
Personally, I don't KNOW enough about sound editing to really make a difference in the OOTB sounds on my Pa900, so I just leave them alone ... I have edited many of the styles for different songs, adding parts, subtracting parts, changing voices, intros, endings, etc. ...
For MY purposes, I look for good styles and the ability to edit them as I see fit, decent sounds, a good vocal processor, and the ability to access what I need 'on the fly' ...

While I may only use a very small percentage of the sounds most of the time, it is nice to have certain voices for that particular time when that voice better fits the song - like a 'Honky-Tonk' piano instead of a 'Grand Piano' ...
Just My Thoughts ...

Just another thought ... An architect designs a house, and a builder builds it ... one person may buy the house, move their furniture in, and live in it and be perfectly happy, while another person may buy that house, change lighting fixtures, wall colors, etc. etc. to 'make it their own' ... same with KBs ...