I am not a fan of voluntarily putting old pipes under high pressure. Unless your main line is not draining dont touch it. If its clogged I'd try snaking it out. I've had roots grow into mine somehow and what the snake pulled out kept it clear for a few years. Amd if that doesnt work I think I'd replace the main rather than jetting it.
He also said I have root issues, but I don't buy that because there's only one tree near enough to have roots be a problem, and it's basically dead.
I should also mention that the actually blockage was clearly caused by other issues, because he pulled out some sort of plastic light cover (that likely got in there because the trap cover had been on and off and things moved around after the fire) and a small cotton rag.
I wasn't even thinking about doing what he suggested, especially since he said it would be $1100. Mainly trying to figure out whether I should bring in someone I might be more willing to trust, or whether I should just leave everything as is for now.