There never was a "2.88 MB" drive for the Amiga, but the principles used can be applied to the PC. I'm not sure that you can put three 8KiB Sectors in a single track but I think you probably can put one 16KiB Sector and one 8KiB Sector on a track. It is possible to put one 24KiB Sector on a track but you would need to do Error Detection in software.
OK. Except for formats having their own 0xFX code, 0xF0 for what will become A: or B: and 0xF8 for all other cases is a rule-of-thumb that makes sense to me.
However, 1966080 Bytes is 1.88 MiB, which is still < 3.5 MiB... and I don't think Amigas can use a "2.88 MB" drive.
Or are you suggesting we should put the floppy/superfloppy frontier at 4 MiB
GiB? What is a superfloppy for you?
Even putting 11 1KiB Sectors per track would achieve 3.52MB.
I never thought about the distinction between floppies and superfloppies. I always treated standard floppy formats as "floppies", anything else as "superfloppies", or I suppose possibly "subfloppies". I have never used a superfloppy. I called the up to 36MB El-Torito Images "extended floppies" as they use the standard floppy Geometry except for the number of Cylinders.
Only the A:/B: vs. C: distinction is really important.