The reason why is that "DOS sound card drivers" mostly don't exist (*). There are configuration utilities for plug and play cards, but those aren't exactly drivers. DOS doesn't have a sound API, unlike Windows, OS/2, Mac OS, Linux, etc, so DOS apps have to talk directly to the sound card - looked at another way, each app/game comes with its own suite of sound card drivers. That was pretty limiting, hence why Soundblaster compatibility was such a big deal - if an app could talk to a Soundblaster, it could talk to that Soundblaster-compatible card. Trouble with that, is that ISA Soundblasters (and Soundblaster Pro or SB 16) used hardware resources that were essentially specific to the ISA bus, so MCA, PCI, USB and PCI Express sound cards can't really be "SB compatible" in the same way ISA ones could be. They use different hardware resources (and USB, for example, can't be talked to in the same way as ISA at all - "base IO addresses", "IRQ lines" and "DMA channels" are meaningless for a USB device).
(*) - Some cards, especially PCI ones based on the Ensoniq ES137x or the Aureal 8820, did include programs that were essentially "SB16 emulators", that would intercept calls to an SB16's hardware resources, translate them and pass them on to the card. These could be considered "drivers" of a sort, but they're kind of a kluge, and weren't made for a lot of cards. Win9x, DOSBox, OS/2's DOS VM, WinNT's NTVDM, Virtualbox, VMWare and similar also use a trick like this to pass DOS audio on to whatever sound hardware the machine actually has, too - they pretend to make something available to the DOS app (usually an SB Pro, SB16 or SB AWE32, plus an OPL2/3/4 or General MIDI synth), then translate that into OS-level sound API calls, which the sound drivers then turn into whatever the actual sound hardware is expecting.
It might be possible to have some kind of SB-emulating driver for newer cards, but I'm not aware of any. Best bet, if your modern machine still has any PCI slots, would be to try to find a card based on the ES137x or Aureal 8820. Failing that, there is a PCIe version of the Audigy2, but I have no idea if it can be bludgeoned into providing SB16 emulation or not.
Main Box: Macbook Pro M2 Max
Alas, I'm down to emulation.