Name that tool again??

Why would one use vice grips to squeeze a hose fitting? Aren't vice grips used to hold something or spin it once it grabs on? I would think to squeeze a fitting down tight, one would use something solid and longer with more leverage. I don't know, just thinking aloud again.
Vise Grips are quite inexpensive for companies to buy and weld on their own jaws. Once you get the tension set, every crimp comes out the same. I have electrical terminal crimpers that work the same way. Every crimp is the same. Like the flange tools for sheet metal.