In reality, you are not going to lose anything, and more than likely, your back and other body parts will thank you for the decrease in weight and bulk. The keyboard will do do everything your current board does, and then some. It has an enormous number of incredible features that are rarely explored by most owners/players, plus you have the advantage of a wonderful onboard sound system that is great for doing small, intimate jobs such as living room parties and background music for small venues. As for the tilt screen, I doubt that you will miss that, mainly because of the huge improvement in the display when Yamaha switched to supertwist technology, which makes the display much brighter, sharper and easier to read at nearly any angle.
Good luck,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)