I've always treated WiX as one of those "finished" projects that never needs updating. I'm still using some old version from 10-20 years ago. What could they possibly be still changing? Didn't it just work already?

Well, we've had a few CVEs to work around Windows vulnerabilities, and one of our own making. :( We've also improved the integration with modern Windows build systems. Now adding some features to the language to make it easier to use for simpler installation packages (still more work to do).

In this day and age, it's very hard for software to sit idle.