I can come back to a go module I write today months later and do a build. `go.mod` specifies exactly what version of what dependency I used, and `go.sum` provides the checksums. Even if the original repo was shut down, there is a good chance the `GOPROXY` I use has it cached, and failing that, if I am really worried about long time availability of dependencies I can always do a `go mod vendor` and check everything in my own repo.

Heck, I think half a year ago, I unearthed a project I wrote in Go1. ... I think 6? 8?, Anywho, way before modules were introduced. All I had to do to get it to build was a `go mod init app && go mod tidy`.

And all of this is baked into the official toolchain that comes with the language. So is testing, benchmarking, documentation-generation. As a bonus, the official proxy provides a handy way for package discovery, but without relying on any one centralized repository to fetch said packages.

The language itself doesn't change a whole lot, and by design encourages a straightforward and to-the-point style of doing things, (at the cost of being somewhat verbose sometimes, but I think that's an acceptable tradeoff). The result (and also a big thanks to `gofmt` at this point) is a coding style that is pretty consistent between many modules written 5 years ago and projects started yesterday. The designers make sure that newer versions of Go itself don't break things, with even generics not breaking any backwards compatibility.

And if I want to upgrade a dependency, there are only 2 possible outcomes: Either the go-tool can resolve the dependency graph to something that works for everything in the project, or it cannot. Either way, provided I `go mod vendor`ed, I won't end up in a situation where I just cannot build any more.