Out here a drain that keeps blocking often has a long run behind it, and that is exactly where jetting earns its money.
Clearing and cleaning are different
A cable makes a hole through the blockage so water runs again, but everything coating the pipe stays where it is. That is why it comes back sooner each time. Jetting washes the pipe walls properly.
Long runs collect more
Homes set well back from the road have long drain runs with gentle falls, which gives grease and residue plenty of opportunity to settle along the way. Those lines respond much better to being washed out than poked through.
Useful after roots have been cut
Once roots are cut out of a line, jetting clears the fine material left behind that would otherwise catch the next thing to come down.
When we will say no
Old clay or cast iron that has already thinned may not stand the pressure, which is exactly why we look with a camera first. On a fragile line we will recommend lining instead of risking turning a blocked pipe into a broken one. And on a septic system, jetting the house line will not help if the tank is the real problem.