Rails dev here, still using it, still plan on using it, use agents, don't see them making food gun decisions with rails apis just code.

Rails comes with the console by default, so production inspection of a bug is something the ai can do without a ton of bs to be set up, and that console can be forced to be auditable (using standard gems) or read only (using flags).

I used to love rust, still do sorta, but yeah I think this is really not a good argument against a tool that operationally is better at most things at being observed or poked or prodded or tested in production