POW is a mechanism to make an expensive id
NO where did i say useless (dont even start more social drama by injecting your own words)

satoshi chose PoW instead of PoS because Pow is useful for the fact that it has a cost component of making an ID.. its why it has the word "work" in it, becasue it requires effort

the decision was put as a consensus(separate feature) rule.

if the OP is having issues about decisions of timing or if PoS should be used, or if difficulty should be adjusted to CPU rated solving. that is a CONSENSUS issue/debate.. not a PoW debate

PoW does not make decisions. it just makes a strong ID

the choices/decisions are part of consensus debates of what decisions should remain as set hard rules that should not be touched, or things that could be(if done safely without risk, bug, breaks of the network)