I am curious what is your problem if blocks are not full? Because I think its better to have the capacity for more monetary transaction in the future and there is no need the blocks to be full.

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If miners aren't incentivized to mine, they won't spend the energy to mine. If bitcoin still has value but mining doesn't, it becomes more economical to attack Bitcoin than to defend it. The sanctity of ledger permanence is more important than the sanctity of a hard limit. I pray we never need to make that choice.