Yeah I’ve encountered the benefit of this approach recently when writing WASM binaries for the web, where binary size becomes something we want to optimize for.
The de facto standard regex library (which is excellent!) brings in nearly 2 MB of additional content for correct unicode operations and other purposes. The same author also makes regex-lite, though, which did everything we need, with the same interface, in a much smaller package. It made it trivial to toss the functionality we needed behind a trait and choose a regex library appropriately in different portions of our stack.
The de facto standard regex library (which is excellent!) brings in nearly 2 MB of additional content for correct unicode operations and other purposes. The same author also makes regex-lite, though, which did everything we need, with the same interface, in a much smaller package. It made it trivial to toss the functionality we needed behind a trait and choose a regex library appropriately in different portions of our stack.