Responsible disclosure makes sense when the user and the manufacturer have the same goal of the product being secure. Jailbreaking is a case where the user and the manufacturer have opposing goals: the user wants to be in charge their hardware, the manufacturer wants to prevent the user from being in charge of their own hardware. Responsible disclosure doesn't make sense, the manufacturer would just patch the vulnerability before users could use it.
If manufacturers had a sanctioned way for the user to get root access to their own hardware, responsible disclosure would've made sense, but as it is, vulnerabilities are a useful tool for the owner of the device.
To me as a user, responsible disclosure is most-valuable for every vulnerability that could be exploited remotely without me being in control.
The video draws exactly that picture, a nefarious actor, remotely taking control over my TV and recording Audio from it
Exactly. This control-freak nature of manufacturers is sadly what makes me cheer for the security holes much of the time.