It is a big deal. There is thr whole set of ways humans can gauge validity of the info, that are perpendicular to the way we interact with fancy autocomplete.
Every single word might be false, with no pattern to it. So if you can and do check it, you just wasting your time and humanity’s resources instead of finding the info yourself in the first place. If you don’t, or if you think you do, it’s even worse, you are being fed lies and believe them extra hard.