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Because X.org can run on any piece-of-shit old legacy 1980s video card with 2 MB video memory that can output colors on screen with a VESA framebuffer on a simplistic device driver.
But with Wayland you need a relatively modern graphics card that supports OpenGL and a device driver with support for KMS and hardware acceleration.
No you don't. RPi runs Wayland right now, with software rendering (and IIRC it already runs better than X). Wayland is backend-agnostic, you can pretty much run it on anything if you just write a backend for it.
zram is used by default in live mode for Kanotix LinuxTag edition. Without 1 gb ram was not enough to surf longer with KDE edition and it lets you use LXDE even with 512 mb (or a bit less). Seemed to be stable enough.