If you are holding onto Harmony 17 or 20 because "Countryboy runs fine," you are missing the forest for the trees.
If you are looking for actual that make the software "better" for professional work, here are the highlights: 🚀 Key Professional Improvements
: This effect node makes it easy to add a "line boil" or vibrating texture effect to your lines, giving character movements a more traditional, hand-drawn feel. Technical & Compositing Upgrades 32-bit Floating Point Rendering
New deformers with dedicated controller handles provide more natural movement for complex character rigs.