I'm probably not typical. But one of those who don't use more than a handful or two of sounds. It amazes me that someone might need MORE than the several hundred on board.
Styles, that's different. I have most everything I need, but new ones can add freshness. Years ago I built almost everything I used from scratch. It's not necessary any more, but I do change drums, style part instruments, volumes, etc. quite often.
My arranger is a tool, which I use to make money and inflate my ego. If I were just playing at home, I probably wouldn't play at all, except maybe strum a guitar.
I have forgotten the question, so will go quietly now.