POW is a mechanism to make an expensive id

NO where did i say useless (dont even start more social drama)

satoshi chose PoW instead of PoS because Pow is useful for the fact that it has a cost component of making an ID

the decision was put as a consensus rule.

if the OP is having issues about decisions of timing or if PoS should be used 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)