Reasonable concerns about high pressure water
Will jetting damage my pipes?
In sound pipe, no. In pipe that is already failing, it can, and pretending otherwise is how a plumber turns a clog into a dig. The camera inspection beforehand is not an upsell, it is the step that answers this question before the equipment comes out.
Is it worth the extra cost over snaking?
If the line keeps blocking, yes, because you are paying once instead of every few months. For a first time single clog, snaking is usually the sensible spend and we will say so.
Can jetting clear roots?
It can cut and flush roots out, which is more thorough than parting them with a cable. But roots got in through a joint or a crack, and that opening is still there. Jetting buys time; the sewer line page covers the permanent fix.