Even the NSCA guidelines call for .7-.9 grams per kg of body weight.

There is more nuance to this, but you are correct, most people try to eat too much protein.

There are places where evey less protein may make sense. If you are grossly obese and trying to lose, you may be better off with slightly less protein that the recommended so that your body breaks down excess tissue and recycles it (less skin flap). If you are trying to gain muscle quickly, or recomp quickly, you want to eat more protein (maybe 50% more than the number you have here) so you max out the protein pathways while under stress.

Everyone else, like 80% of the people that are tracking their diet, should stick to 0.8g per kg.