All the other transitions could be handled by virtualization and emulation, and the software and the corresponding data files could be copied between file syste

All the other transitions could be handled by virtualization and emulation, and the software and the corresponding data files could be copied between file systems and drives, so if you have built a workflow around a legacy app, you could still access it on new hardware. But iOS being such a locked down and closed platform means there is currently no way to preserve legacy apps or the data stored within installations. This is why dropping 32bit legacy app support is such a big deal.