Note that just because everything is digital doesn't mean something like that isn't necessary: If you depend on your service provider to keep all of your records then you will be out of luck once they ... stop liking you, go out of business, have a technical malfunction, decide they no longer want to keep any records older than X years, ...

So even in a all-digital world I'd still keep all the PDF artifacts in something like that.

And I also second the suggestion of paperless-ngx (even though I'm not using it for very long yet, but it's working great so far).