This would still mean that (the deeper the dependency tree) updates take longer to trickle down to your project, and to spread across the whole ecosystem. Not everyone will have these tools set up, and they will still cause a delay since it's a waterfall - one maintainer merges the PR days after it gets raised, then they release a new version maybe a week or month later, then PRs for that package get raised, and so on. As the writer of an application I like the power of short-cutting that path if needed for an important update of a transitive dependency by simply telling my package manager to update the lockfile, vs having to wait for the update to trickle through the chain of dependencies.

This may not be a problem in Go, where projects don't have that many dependencies and dependency trees are usually very flat, i.e. dependencies don't often have subdependencies¹. But in the JS ecosystem an average application has thousands of dependencies, many levels deep (as it's super common for libraries to have many subdependencies), so the effect on the ecosystem would be huge. And if there are more old versions around, that creates more maintenance effort for maintainers (you cannot avoid this with policies no matter how hard you try, proved empirically by having been an open source maintainer of many projects).

¹As to why this is, I think it is partly because Go dependency management has been so bad - you can't really depend on other packages in your library if there is no standard way to declare them. Better and more standardized dependency management will likely also make people rely on dependencies more (especially in libraries, so the tree will become deeper). But it's also some culture in Go I've observed that I've heard being described as "copy+paste oriented programming". Go is more verbose than other languages and people don't have a problem with duplicating code that much. And the Go standard library is enough for most use cases - on the other side, native JS APIs are notoriously bad (especially historically with browser differences etc), so relying on libraries for everything is completely natural (you're weird if you don't).