Not doubting that pushy idiots are going to pushy idiot, but I think you’ve strawmanned the actual reason hard enough.

Most people who want it back don’t need, want, or understand why secure messaging exists.

Here’s the simple facts:

SMS is not secure, or private.
Signal is for secure, private comms.

As mildly inconvenient as it is, Signal explained their reasoning in great detail, and I happen to agree: There should never have been an insecure option on a secure messaging app.