I suppose it was inevitable that this method is cheaper than a pure hardware solution. A fast 680x0 can probably be emulated directly in CPLD but it's much less

I suppose it was inevitable that this method is cheaper than a pure hardware solution. A fast 680x0 can probably be emulated directly in CPLD but it's much less flexible than pushing all the emulation into a pure software solution. The board is a good way to interface the Amiga trapdoor slot to the Raspberry Pi which is so cheap and cheerful that you can easily dedicate it to this single purpose.