I think you kind of trivialized other arrangers with the 'PSR' comment, Frank. A T3, a PA2Xpro, an E80 is ALSO 'a sit-down and a few presses and your off" arranger.
But with some incredible styles, sounds and OS capabilities, too. It's NOT just the PSR's that are designed for instant gratification. Just about everything EXCEPT the MS is designed so that, when you first get it, at least you can enjoy it, maybe even gig with it

the day you get it.
I just have always failed to understand why Dom never understands this basic requirement for an arranger...