The tricky part is really point 2 there, that can be harder than it looks (e.g. even simple file I/O can be network drives). Async IO can really shine here, tho

The tricky part is really point 2 there, that can be harder than it looks (e.g. even simple file I/O can be network drives). Async IO can really shine here, though it’s not exactly trivial designing async cancelletion either.