[kokada]

> 1 file, 2 files, N files, why does it matter how many files?

One file is better for sharing than N, you can post it in a messenger program like Slack and easily copy-and-paste (while this becomes annoying with more than one file), or upload this somewhere without needing to compress, etc.

> I can't think of any other language where "I want my script to use dependencies from the Internet, pinned to precise versions" is a thing.

This is the same issue you would have in any other programming language. If it is fine for possibly having breakage in the future you don't need to do it, but I can understand the use case for it.