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> resurrecting the old 360KB 5.25-inch floppies tech

Sure, practicability is important as well. The primary reason that nobody is resurrecting 5.25-inch floppies, is simply due to its impracticability. I think many people in the retrocomputing community would like to make a retrocomputer with these crunching floppies, but the supply chain has already vanished, it's also extremely difficult (if not impossible) to make a 5.25-inch floppy drive independently, as it involves custom mechanical moving parts. It's better to use the time to, let's say, a homemade video game cartridge.

Many retrocomputing hobbyists make a liberal use of modern peripherals such as CF cards.

[userbinator]

it's also extremely difficult (if not impossible) to make a 5.25-inch floppy drive independently, as it involves custom mechanical moving parts

The tolerances are not that high and the physical specifications are available from ECMA; most of the mechanical parts would not be difficult for a machinist, it's the heads which are the most difficult. The intersection of machinists and retrocomputing hobbyists is probably not that large, and 5.25" drives are still not really rare enough to attempt remanufacturing.