I basically have three concerns here:
- Disparate version requirements. As you can see, bash 6.3 is about to hit GM, and I believe (by grepping through the changelog) the ABI now requires readline 6.2+. If someone has an outdated readline installed, but now decides to install bash 6.3, potential issues.
- It is the _only_ dynamic link in bash if configured this way; without this, one is free to copy/move the executable.
- The ever-present readline/editline confusion.

But if you prefer, I'll put it back.