[idea] crates.io - sort by direct download

I was looking on most downloaded crates on crates.io the other day and I noticed something interesting. Most downloaded crates are not the most popular crates. I posted an issue on crates.io repository, but I also wanted to add it here.

Problem

I looked at top 30 of "All-time Downloads" and "Recently Downloads" crates. I found lot of crates that I have never used, heard of and probably won't use. Examples: thread_local, aho-corasick, num-traits, memchr

What do I propose

Implement new download counter, counting only "direct dependencies downloads" and allow to sort using it.

Details

The name of the sort is open to a debate. The main idea is this: Each time a library downloads a crate, it would only count a download if downloaded crate was mentioned in cargo.toml file as a direct dependency. All crates dependent on direct dependencies would not count as a download. For example:

[dependencies] 
regex = "*"

Downloading regex crates also downloads dependencies of regex. After downloading regex crate, only regex would count as a "direct download". regex dependencies download count would not change.

Why?

This type of sort would really indicate what crates are most popular. This type of sort would help to increase popular high-level crates discoveries. It would move tokio, Rocket or other similar crates more to the top and decrease the noise of crates most people probably won't use.

Problems with implementation

This would probably require some additional implementation in the cargo's code.