AbdullahD said:
16 hr shifts, 8 hrs off and then back on
Boy, do I remember those.

That was mandated OT. Not voluntary.
Even just in the last ten+ years since I retired, the union has made gains our generation never dreamed of,
Meal allowance, meal breaks, early and late call provisions, stress leave, presumptive legislation for PTSD, power stretchers and stair chairs, guaranteed car counts, early retirement, less physically demanding work for senior paramedics, etc...
Other than the Working Quarantine policy, we never had any of the above.
The idea of guaranteed job security is a myth.
An Ontario arbitrator upheld the dismissal of a Toronto paramedic after his judgment was called into question due to non-criminal, off-duty conduct,
https://www.hrreporter.com/columnist/employment-law/archive/2013/04/22/professional-conduct-outside-of-profession/
"Certain jobs require a high level of skill and a high level of trust from both employers and the public. For employees working in those types of positions, it’s possible that off-duty behaviour can call into question that trust, if it demonstrates poor judgment. And if an employer no longer has confidence that an employee has the judgment to perform a job of high skill and responsibility, the result could be dismissal."
That's just one example. Posts on social media have been career suicide for others.
If you become a public disgrace, they will fire you.