You just described the only part that’s not new, aka: triggering the immune system. that’s the most important part regarding the prevention of covid sickness, however that’s clearly not all the story about this technology.

It always amazes me how people can not realize side-effects happens almost by definition outside of the model used to design the system, or make the plan. There’s a reason we usually require something closer to 10 years before deciding to authorize mass use of new drugs on a whole population. We want to be safer regarding « unknown unknowns ».