By the looks we can't have a consensus mechanism with all suitable elements which will basically describe it as perfect.
Considering the advantages and disadvantages, it is left for us to utilize each consensus mechanism to to best of its capabilities.
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It is rather tough to design one that is flawless. There are always points of vulnerability, at least in theory.
Bitcoin did a good job of growing passed the point of 51% attack so it is secure in my opinion. The scaling still is an issue.
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