That's not necessarily true. SSL/TLS does not prevent all MITM, it prevents unwanted MITM.
To be fair, I don't think you can install certificates on a Chromecast for example, so it might not be practically feasible for all devices, but a blanket "SSL makes that impossible" is not correct.
To be fair, I don't think you can install certificates on a Chromecast for example, so it might not be practically feasible for all devices, but a blanket "SSL makes that impossible" is not correct.