because it disintermediates the entire payment sector, and every single dollar going into the pockets of banks /payment processors is going to go to consumers, or be returned to the public.
It'll help underbanked people because by virtue of being a US citizen, or whatever jurisdiction we're talking about, you'll have free access to a costless payment system. It'd also unify and standardize payments across an entire currency zone, getting rid of the bazillion API / interface issues that the currently glued together system has.
The benefits are pretty obvious. As to employment, if we're going to create employment through bullshit jobs we might as well set up a toll booth every ten meters until there's no unemployment or have people roll stones up and down mountains.