John, please don't assume what people are 'above all' interested in. Personally, I could care less what the trumpets sound like! But a first class piano is the backbone of any keyboard. It is what we learn on (mostly), and probably the instrument we know what it SHOULD sound and play like the best. Then many of us learn on organs or accordions... So all of those HAVE to be as good as possible.

How many trumpet players here? LOL

Me, I'm probably most interested in whether the drums and bass are top notch. Without those nailing the rhythm section, what's the POINT of good brass or trumpet sounds (or anything else, basically!)?
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An arranger is just a tool. What matters is what you build with it..!