Really? Like actual internal floppy drives, and not just USB floppy drives (which even Windows still supports)?

I actually wouldn't expect macOS to support actual floppy drives since the OS's list of supported devices doesn't include any that shipped with floppy drives. The fact that I cannot install the latest macOS on any devices older than 2019 is a related, but separate problem.

In this case, what would internal floppy drive mean? The last Macs with floppy drives (I think Old World G3s?) used a custom Apple controller, integrated into the chipset, with a bespoke 20-pin cable.

USB floppy drives indeed.