If 6.17.724 stops working tomorrow (Google changes APIs often), you should immediately search for (current versions are in the 19.x or 20.x range). The developers migrated all features—plus new ones like Android Auto support—to SmartTubeNext.
If you hate ads and refuse to pay for Premium, Smart YouTube TV 6.17.724 is objectively superior. However, if you rely heavily on seamless casting from every device in your home, the official app (or Premium) remains more stable. Smart Youtube Tv 6.17.724 Apk