Xkb gives me eight different layers just on the shift keys (not the control keys etc.). Just takes a ton of time to learn because Xkb is borderline arcane (:)) and because you have to do everything manually if you want something beyond “swap control and Caps Lock”.

If time is money I wouldn’t be surprised if I could have saved a lot of money by just buying a mechanical keyboard with good on-board firmware and programming. At least I have a hard time imagining that the programming would be harder than on X.