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There are some efforts for lowering the overhead and would be interesting to explore how we could further do it.
First, we allow sharing `Cargo.toml` fields across the workspace since 1.64.0 [0]. In the upcoming 1.71.0, we extend this so that `cargo new` will automatically inherit fields when creating new `Cargo.toml` files [1].
From a different angle, we are also adding support for single-file packages though this is more meant for binaries [2]
[0] https://doc.rust-lang.org/cargo/reference/workspaces.html#th...
[1] https://github.com/rust-lang/cargo/pull/12069
[2] https://github.com/rust-lang/rfcs/pull/3424
"private" trait impls (1) would be a much better solution. You probably never want the impl of a trait for a foreign type to be exposed to other crates, it's so unlikely that forbidding it in the name of coherence is a probably viable. But there's apparently many gotchas and no one has clearly written a way around them (2).
(1) https://github.com/rust-lang/rfcs/issues/493 (although the comment section is kind of unhinged and goes off on distant tangents to modular typeclasses and first class modules)
(2) http://smallcultfollowing.com/babysteps/blog/2015/01/14/litt...