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What the Retina Z2 offers is most likely a software emulation that converts data by the CPU. I am not aware of a RAMDAC that offers something like HAM, or a VGA chip that supports more (or something different) than 4 planes. Otherwise, the Retina Z2 is a quite useless card as the NCR chip it is based on only supports segmented memory (no linear/flat framebuffer) and only EGS and some very old versions of P96 supported that.
Games and software can profit massively from the chunky mode RTG hardware offers as there is no chunky to planar conversion needed. However, it requires programs to use the Os interface to the hardware, there is no universal "hardware register set" as for AGA. Hardware-banging bye-bye.
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