This isn't just an arranger issue, mind you. I see this in the studio all the time. We call it 'turd polishing'

You see, if a tune is great, it doesn't NEED every last part tweaked and effected to hell and back. It just WORKS. But so often, a writer or musician will fail to see that the basic song or part itself is bad, and will continue to massage it forever in some vain way of thinking that that will magically transform it into a masterpiece

Listen to some sixties classics, and gasp in awe at the 'perfection' they achieved. Then try to count how many effects they used.

My G70 can have upwards of six separate effects on different Parts, including two insert effects with dozens of choices. If I CAN'T make great music with this amazing palette of sounds and effects at my disposal, getting a more capable arranger isn't going to make a difference.

If your needs are for something that as yet doesn't exist, for capabilities that are beyond what contemporary arrangers can do, perhaps you are looking at the wrong kind of tool for the job? Or perhaps you are looking for an excuse as to why you haven't ALREADY made great music with what you have...