Reduced, the assertion made is: Because Proof of Stake requires less energy and is less secure than Proof of Work, all block chains are secure if and only if co

Reduced, the assertion made is: Because Proof of Stake requires less energy and is less secure than Proof of Work, all block chains are secure if and only if computing blocks requires a large investment of energy. I don't think Proof of Stake is sufficient evidence to make that assertion. The source makes me even more skeptical, as they are invested in Proof of Work's continued dominance.