Because the rust crowd spent a lot of time learning rust, and they’ll be damned if it isn’t the literal savior catch all silver bullet solution to programming.

I feel like android did that first, but I’m not sure.

In that case leave the files alone for where they’re located.

You could install sudo instead of jumping into a root shell every time you need to do root privileged tasks.

For the first question, are you using a package manager? If so, I’d say leave it alone. For the second question, your root will likely still be bash unless you changed it yourself.