I've been spending too much time on this, So this is the last post in response to the multiversal punch.
In summary. Superman koed WF, obliterated his anvil, effectively destroyed his multiverse. That is all the information that DC has given us.The multiverse destroyed was due to Superman broke WF's anvil or it was destroyed by superman punch's shockwave?Who knows, The comics hasn't given us the answer, it only stated Superman destroyed WF's multiverse
And, There is no evidence that can prove the multiverse is unstable or uncompleted.On the contrary it was contructed by the most stable universes and it had hundreds of dimensions, Apokolips and hypertime already, There is no reason to doubt the multiverse was unstable or uncompleted, It was fully realized and well-functioning.