Phil
Sorry if this teaches you to such eggs but
Bait runners have two clutches,
One for the playing fish
One for that first initial take
They have a front and rear drag,
Others
The front drag does both jobs, ie
Playing fish and that first initial take.
Bait runners use the handle to change from the initial take clutch to the playing fish clutch, each one can have it's own setting.
Others, you adjust the front drag
The only difference between the two is one uses the handle to switch over the other is switched over by you, using the front drag.
As I've said, both are exactly the same in principle but they both use a different mechanism to achieve the same goal.
Anglers can let a fish run on both bait runners and other reels, they still both have to be activated by the angler.
Some people prefer the handle method, some people prefer the front drag method, it's the same. Both sets of anglers can be irresponsible, and it's the angler that is the problem not the reel.