Should emergency brake stop car?

Having said that, should I ever lose my hydraulics entirely I’M PULLING THE HANDLE! My parking brake WILL be used as an emergency brake even if it fries trying!

Me too, and I had to do it once when a brake line bust (rusted) and the dual brake cylinder divider also broke. It stopped but I was almost all the way through a busy intersection by then. It was luck and good driving by several other drivers that saved me from an accident.