You mean SEO? Compared to other forum software, Discourse does a good job with following proper SEO url practices out-the-box. It looks like you’re trying to make the url shorter but in the end, google’s algorithms look for the following:
- Original Content.
- Trust & Identity.
- Authority of the site’s subject.
- Visitor receptivity (low bounce rate; links elsewhere that point to your site, ect.)
You should be “worried” more about the content on your pages than the technical semantics.