Yes, sometimes when it's a particularly large transfer I want a progress meter b...

Yes, sometimes when it's a particularly large transfer I want a progress meter but I normally don't so it's in the way; perhaps when we all had modems. And from a script I'd still want to use -sS instead of -s because although the script is obviously checking curl's exit value the user wants to see curl's specific complaint before the script's own knock-on diagnostic.

    $ curl -s does.not.exist; echo $?
    6
    $ curl -sS does.not.exist; echo $?
    curl: (6) Couldn't resolve host 'does.not.exist'
    6
    $