There's 2 issues that could be solved with this. First, giving users both the pros and cons of each shell (and a warning that using fish they will have issues with flatpaks, also adding that to the wiki and/or before they install dr460nized if possible) and second, it would quickly enable users to change shells without having to search on how to change and enabling the Garuda stock configurations for each shell.
The only complication is that I don't know how much work it would take to implement this, but if it doesn't take too much time and effort, it could make the distro even friendlier to noobs.