Here’s a small but useful improvement in Ulysses 17. You may already be aware that there’s a feature to automatically continue lists; you can activate it via “Edit” › “Replacements” › “Smart Lists”.
Now, with the latest version, the lists have become even smarter. If you update a list — by adding a new item, removing one, or changing its hierarchical level —, the ordinal numbers of the following items will be updated automatically. Yay!