Interesting! By default if a download fails halfway through, will there be a partially downloaded file kept around?

Meaning if I run this command the first time kicking off a download, but this download fails, the 2nd time I run it'll always skip since the file exists already.

Wouldn't a resume option do the same and more?

I could see where skipping files could be useful, but imho it's easy to deal with in scripts, resuming OTOH isn't and would skip files if the size match (possibly with a variant to skip if length can't be pre-determined or transfer can't be resumed...).