sorry about my ignorance, but what would happens if the protocol itself would ask the miners to go for all the transactions no matter the fee size just following a timestamp that would determined that for certain transaction to be processed first all transactions that were made before must be confirmed?

I understand that there has to be a reward for mining in order to keep the thing going, but it seems that we are losing the main point here.
the value should have to be in the usage of the coin rather than being in the speculative store of value, and theres no value in an usage that its being controlled by someone that says if a transaction is important or not by a fee.