I think it's good practise to build something CMS like for fun - as long as you don't expect it to be useful or used, outside of maybe your personal page. It's useful to experiment and learn stuff that might be useful at scale in other projects.

I intentionally made a few interesting choices for my stuff, just to see how far you can push it, and to make sure no sane person would ever use that in production (like, from before Markdown was around, I was wondering how far you can get with doing a simple markup language parsed by using regexp only. Turns out, surprisingly far, but if something doesn't parse as expected later on you have a bit of a problem)