Comment by bananaboy
I just now went searching to see if there were any better quality GM drivers for Windows that let you upload a soundfonts and it looks really dire out there! The one that mainly shows up is VirtualMIDISynth (https://coolsoft.altervista.org/en/virtualmidisynth). It seems like it supports Windows 11.
SoundFont® synths were never good. When Creative added this feature to their sound cards, they were trying to provide a cheaper alternative to dedicated hardware synths, but it did not match the quality (though it was still a step up from FM). And in the modern era, this obsolete format has somehow become more popular, now via software reimplementations, because of the catchy name or something?
I also want to point to Nuked SC-55, but that is also not based on SoundFont®.