Installation in buildings. Try pulling a bundle of CAT6 cables from a comms closet with huge plastic blocks from zipties jutting out every other foot through 10-50 feet of drywall and/or drop ceiling. Loom doesn't even warrant a sarcastic comment in that context. The biggest advantage is of course the string takes the brunt of the stretch stress.

I'm not gonna go lace up a DC but it's still useful enough that every hardware store around carries rolls of twine right next to the cable spools and zip ties.