Please! Can we get off the weight thing... The vast majority of players who will buy a Kurzweil are not so elderly that they can't hump a 45lbs keyboard!
Sure, OK, for the NH 'entertainer' who is up there close to their audience's age, it's a bit much. But, OTOH, what NH OMB is going to want one of these anyway?
You should try moving my fully loaded K2500S... 55lbs! The studio's K2500X(88) - 72lbs. And a TON of pros used those!
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An arranger is just a tool. What matters is what you build with it..!