All of it, however if you cannot differentiate between specialist jobs that require specialist equipment, and general jobs that general equipment will do, (This applies to music, building, finance, cars and 100s of other types of jobs) then it is pointless continuing this discussion, and you can continue to believe that your arranger can do everything that every other musical instrument can do, and that anybody that thinks otherwise are dumb, and don’t know the first thing about musical equipment.
Just think how much money could be saved if we didn’t have to pay for live bands, orchestras, studio and software engineers, music computer specialist and acoustic instrument engineers etc. as everything could be done on an arranger. (What a sad world it would be where uniqueness, innovation and far out thinking was replaced with canned styles, limited sounds and limited features, so that everybody sounds the same as everybody else (Sounds like a me too movement)

Bill