From Discord:
"As of v6.5.0, all major features for v6 has been implemented. Most recently, autoResumeMaxDownload, enhanced blocklist, and seasonFromEpisodes. You will need to add these options to your config if you migrated during v6 launch.
cross-seed is now complete in terms of finding cross seeds, future development will go towards expanding support for more user setups. If you have been using nightly, we appreciate your help testing and recommend switching to latest going forward."
https://www.cross-seed.org/
If you aren't already using cross-seed and are on multiple trackers with video, highly recommend trying it out. For a little setup cost you can be seeding the same shows and movies to many trackers, and if you have an arr stack/autobrr it only gets better from there. Partial matching was also added in v6 for sites that have external subs, nfo's, or even samples included, and it works great to find matches in those cases. Just be careful, as some sites might have altered video files which can cause issues, but most good trackers will not have that issue.
If you're still using v5 or lower, check out the migration guide to v6 as there was many new features beyond what I listed added in v6 and a few changes that for niche setups will require some changes.