- less convenient: Addressed by my comment.
- no preview: I do not want preview, so this is a bonus. It's also orthogonal, since if the search bar was configured to preview, it could also display bang results.
- not portable across search engines: It already works on all non-terrible search engines because they standardized the bangs.
Not addressed, Shift+1+w is less convenient than w, try to address that by your comment!
> I do not want preview, so this is a bonus.
Not a bonus since you can achieve the same natively, so again not better
> It's also orthogonal, since if the search bar was configured to preview, it could also display bang results.
No it couldn't? What's your preview link to DDG to show the results of a Wikipedia page for a given search term in the browser?
> - not portable across search engines: It already works on all non-terrible search engines because they standardized the bangs.
Since these don't exist (DDG is very similar to Google in search quality), it doesn't work. But this is personal, so if your needs are narrow enough to be covered just by DDG+Kagi, than you obviously don't need portability.