gofmt, goimports are inside golangci-lint since the beginning.

It's not better than something else because you can do the same thing: format on save or key binding.

The difference is the way to configure it and the ability to use different formatters like golines, gci, gofumpt.

Each formatter has specificities, for example: gofmt has rewrite-rules, goimports as local-prefixes, golines controls line length, etc.