It's not an issue, until someone finds a way to mitm the request, send a special payload to your Roku that is then opened by an unpatched ffmpeg (https://www.linuxcompatible.org/story/asa2020074-ffmpeg-arbi...) that allows an RCE and turn your Resident Alien into a Resident Zombie.
Your credentials might go to a different endpoint, but the device is still limited in its TLS support as a client.
The attacks aren’t entirely practical, and the threat model for “someone cares enough to MitM my streaming connection” isn’t a common one, but it’s much closer to practical compared to attacks on TLS 1.2 & 1.3.