Until you need access to a feature that the latest version of the tool doesn't support, so you have to jump through hoops to find and download an old version and attempt to get it to run on a newer unsupported version of OS X. I see no good reason not to just provide a web interface which enables you to configure the router from any computer with a web browser.
I agree. It may very well be just what I was used to, but I've always found the networking/configuration software very straightforward.