The Dept. I was on, as of 1989, when hired you had three years to become a Paramedic. So when anyone applied after 1989 you knew up front that you also had to become a Paramedic. If you didn't want to become one, then don't apply.
There is positive and negatives to it. It's helpful to be able to make sure that in the future there would not be a shortage of Paramedic coverage, which it was quickly becoming when I got on.
A negative is that someone may be a great Firefighter, but not be able to obtain Paramedic status. Or someone who is already a Paramedic may struggle to be a sufficiant Firefighter. So you can lose quality people that really can't do "double duty"
It can also show that what people that can do both jobs successfully can reflect more positive for the Dept. with the public and state and national officials.
Not only do you have to become a Paramedic in those three years, but you have to be certified in HazMat, at least a FF II, Pump Engineer, and Extrication. Since I've left they may have amended some of these things, added or removed them.