> Until very recently hardly anyone ever changed hardware on their Macs.
This isn't entirely true. Since about '88 most Macs have had expansion slots (Nubus and/or PDS, later PCI). The main uses have been processor upgrades (in some cases containing almost-complete motherboard rehauls) and fancy 2d graphics accelrators; also some video and sound editing boards. However, consumer 3D cards came late to the Mac.
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> Until very recently hardly anyone ever changed hardware on their Macs.
This isn't entirely true. Since about '88 most Macs have had expansion slots (Nubus and/or PDS, later PCI). The main uses have been processor upgrades (in some cases containing almost-complete motherboard rehauls) and fancy 2d graphics accelrators; also some video and sound editing boards. However, consumer 3D cards came late to the Mac.