That's because arrangers actually have some versatility now. Several intros endings fills, and many bars per loop instead of 1 or 2 intros and endings and 2 bar loops. Arrangers are stepping up their game, and the quality of sound is getting better so it doesn't sound totally awful when a keyboard tries to emulate a guitar or sax. If the perception towards arrangers have changed, it's because the arrangers have changed, not the musicians. I might own a tyros 2, spent some time thinking about maybe owning an original tyros, but nothing before that would have worked for me; not in a pro sense anyway. Granted I'm not an arranger officinato but I have heard the sound of a lot of them and thought they were fun but not pro. This is changing.