A security camera must be agreed on, it's quality chosen, it's recording backed up, maybe someone watches it live and needs to be paid, they need somewhere to sit and monitors.
All of these things are decision points that can be used to delay any vote. No one here is necessarily trustworthy, but the nlrb is a supposedly neutral organization and presumably has it's own security. Why add more? If you assume malicious actors will compromise one security layer why not all of them?
You have to choose some cut off for security over cost and time. I don't think Amazon is arguing in good faith.