From the page you've specified, Brotli seems optimised for web purposes, so in web servers for serving web pages and content. Don't think it's necessary in Keka, then.
Thanks for the feedback! No tired, just did not get a notification of your post
I randomly decided to check on lrzip and brotli support today, and was happy to see a test build for brotli! Works like a charm so far. No progress indication, but I'm sure you already know that. Thanks!