It's hard to get statistics on conversion when you don't even track users across pages on your own site. It looks like GoatCounter can't show you unique visitors or how they move around on your site because it doesn't track them. There are no cookies on the main page! This seriously limits the kinds of features that can be implemented.
I might make it an optional feature, too. Again, need to look in to it in-depth.
There are a zillion-and-one things to do, and thus far other things have taken priority :-)
That said, having a unique but anonymous cookie within a single site isn't the end of the world but Google only provide GA for free because it is useful for determining other things.