I mean, it all kind of depends on which person is doing the callouts. When you play a role like Reinhardt or Support, you are heavily reliant on the rest of your team to be able to perform for you to be able to rank up. You can't necessarily carry with these roles unless you duo queue and synergize well. If I am playing Lucio on Comp, my best chance for improving my rank is shot-calling. I need to communicate with my team so that we stick together, take the same path, and I can speed boost when I need to. If I am playing Reinhardt on Comp, I need to be sure we have a plan to push together so that people will actually follow me and stick behind my shield. Or I have to say something like "hey junkrat, stop spawncamping them and get to the high ground behind my shield".
Of course, this is a bit different from your team's McCree complaining about heals when he can't even hit his shots. But shot-calling and team communication is generally important to gain wins, especially for your supports and tanks.