I think the people behind "trustlessness" should have chosen a better word. When people that are not familiar with crypto hear trustless, they can associate the solution with the common definition: "not worthy of trust; faithless; unreliable; false". I.e. the solution isn't reliable. I realize that the people behind it are trying to apply the world trustless to the problem they are solving, but that is definitely not clear from the quick soundbites people read.