This is a silly argument. FPGAs are not emulation. They implement logic at just as low a level as an ASIC. One day even working original C64s will stop working

This is a silly argument. FPGAs are not emulation. They implement logic at just as low a level as an ASIC. One day even working original C64s will stop working. You can't get original parts anymore. This is as good as it gets for fixing those.