The choice is to not have any improvements, because your too afraid to mess things up. Adopting modern GPU, sound chips, and modern SATA controllers etc. allows you actually buy new hardware, that is not 30 years old.
FPGA Amiga hardware allows to use new hardware as well. Multiple devices have upgraded sound. SATA and PCIe require SerDes which increase the cost of the FPGA but could easily be added. Modern GPUs with the best combination of performance/power and performance/price are HSA APUs which have the CPU and GPU integrated with coherent caches between them and using a shared flat memory model. All the FPGA hardware has to do is add an integrated HSA GPU to be more modern than the 15 year old PPC hardware using older graphics cards through an expansion that is becoming outdated for GPUs. I guess that's what happens when using the trailing edge of technology instead of leading edge.
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matthey 
