Why Is It Taking to so Long to Implement POS on Ethereum?

My question is not accusatory or criticizing, I would just like to know why the technical challenge is so great? Specifically, there are other coins running on POS correct? What is the reason why one of those consensus mechanisms couldn't be copied and put onto Ethereum right now?

Cheers

Submitted February 13, 2019 at 10:24AM }
via reddit http://bit.ly/2TJdGjK

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