The slightest of non conforming information or a honest paperwork mistake in your application can be used to permanently reject a visa,
Even if you been living for many many years , you have to leave in very short time (10-60? Days) if your visa is revoked/expired because you lost your job and potentially upend/split your family some of whom would be citizens if they were born here
Or be deported out by ICE right after serving lengthy sentence despite living in the country your whole life , to a home country you don’t know and never even been.
Despite all the bad press and difficulties US has a better system than most other countries, however if you are unlucky US immigration can upend your life.