What is the purpose of cognitive bias

There are a number of cognitive biasis documented
We can notice that these behaviours are universal and persistent in people

Why?

There is evidence that confirmation bias makes a lot of sense once we understand that human decision-making is argumentative

It’s might also be fair to notice that there are various heuristics that reduce cognitive load

I also might be useful to notice that in real life situation there sometimes isn’t a lot of time

That the payoff matrix for individual is a bit abrupt if they die but NOT for the species

Actor-observer bias. The tendency for an individual to credit their own situation to external causes while ascribing other people’s behaviors to internal causes.
Anchoring bias. The tendency for the brain to rely too much on the first information it received when making decisions.
Attentional bias. The tendency for an individual to pay attention to a single object or idea while deviating from others.
Availability bias. The tendency for the brain to conclude that a known instance is more representative of the whole than is actually the case.
Availability heuristic. The tendency to use information that comes to the mind quickly when making decisions based on the future.
Bandwagon effect. The tendency for the brain to conclude that something must be desirable because other people desire it.
Bias blind spot. The tendency for the brain to recognize another’s bias but not its own.
Clustering illusion. The tendency for the brain to want to see a pattern in what is actually a random sequence of numbers or events.
Confirmation bias. The tendency for the brain to value new information that supports existing ideas.
The Dunning-Kruger effect. The tendency for an individual with limited knowledge or competence in a given field to overestimate their own skills in that field.
False consensus effect. The tendency for an individual to overestimate how much other people agree with them.
Framing effect. The tendency for the brain to arrive at different conclusions when reviewing the same information, depending on how the information is presented.
Functional fixedness. The tendency to see objects as only being used in one specific way.
Group think. The tendency for the brain to place value on consensus.
Halo effect. The tendency for a person’s impression in one area to influence an opinion in another area.
Hindsight bias. The tendency to interpret past events as more predictable than they actually were.
Misinformation effect. The tendency for information that appears after an event to interfere with the memory of an original event.
Negativity bias. The tendency for the brain to subconsciously place more significance on negative events than positive ones.
Proximity bias. Proximity bias is the subconscious tendency to give preferential treatment to people that are physically close. A physical worker being considered for a raise before a remote worker because they are in the immediate vicinity of their superior is an example of proximity bias.
Recency bias. The tendency for the brain to subconsciously place more value on the last information it received about a topic.
Self-serving bias. The tendency for an individual to blame external forces when bad events happen but give themselves credit when good events happen.
Sunk cost effect. Also called the sunk cost fallacy, this is the tendency for the brain to continue investing in something that clearly isn’t working in order to avoid failure.
Survivorship bias. The tendency for the brain to focus on positive outcomes in favor of negative ones. A related phenomenon is the ostrich effect, in which people metaphorically bury their heads in the sand to avoid bad news.

https://www.techtarget.com/searchenterpriseai/definition/cognitive-bias