You just linked to a search result page where there is only one extension with 57 reviews that purports to be able to do that. It's liable to get pulled if it gets any more popular.
Every other app is just a generic video downloader and many explicitly mention that they cannot download youtube videos due to Chrome store restrictions.
They regularly get pulled. Wanting an app that is going to still exist in a week is not moving the goalposts. The point is that the rules have removed all good apps with those features from the store.
https://chrome.google.com/webstore/search/youtube%20download...