On the other hand, all the security team needs to do is point to the number of billion-dollar breaches that have happened due to phishing. If phishing tests are a game, then so are DR tests, so are code reviews, so is the QA department. If phishing tests are a game, then so are your yearly performance reviews, or showing up to work on time, or meeting your deadlines.
Not destroying the company through your own negligence should be basic standard practice. Repeatedly failing a phishing test even when given proper security education (like PhishMe provides) is negligence that can destroy an entire company.
I worked in security at a company where the IT security department didn't report up the IT chain but was under HR alongside the Internal Audit department. Enforcing policy and holding people accountable were fundamental expectations of our managers all the way up, no different than someone repeatedly harassing a coworker or watching porn at work.