Let's face it, some of the TOTL arrangers ARE heavy. But not un-liftable... Most of your grandkids weigh more! Doesn't stop too many of you from the occasional lift!
Look, guys, there are ways of dealing with weight. Leverage, dollies, the occasional waiter... It can be done. One of the things I have started to do is to place the keyboard (in it's flight case) on any convenient platform (a low table, a couple of chairs, on top of your speakers on the floor, whatever, before you lift it out of the case. It helps your back enormously to not have to bend right down to the floor to lift the keyboard out. Ditto for putting it back IN the case. Try it, it helps!
Many of you do gardening, or a bit of construction on your homes. You are often faced with a challenge to lift something heavy. But do you whine at the cement makers that it needs to be lighter (even if it is less strong and durable..? No, you find a way to get it done.
A little exercise is supposed to be good for us! Just use common sense and leverage, and none of the heavier arrangers pose MUCH of a problem to any but the most frail. Unfortunately, TOTL features come at a TOTL weight (maybe with the exception of the T2, but many dislike that it has no speakers), and if you want no-compromise sound, and a 76 note action (I don't care what anyone says, trying to play the piano sound on a 61 is an exercise in futility if you CAN play a real piano), you will HAVE to deal with at least a certain amount of weight.
Just be grateful that the seventies are over, and you no longer need to lug around a Rhodes Suitcase AND a B3! Even the heaviest of modern arrangers is laughably light compared to the old keyboards we grew up with. My G70 (45 lbs) replaces a van-load of 100 lb. keyboards, and my back never felt better....
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An arranger is just a tool. What matters is what you build with it..!